Atomic structure – atoms, subatomic particles, valency – Question bank
1) Electrons present in outermost shell of an atom are _____
Answer: valence electrons
2) Mass of atom is concentrated in:
Answer: nucleus
3) Atoms of the same element have identical _____
Answer: atomic number
4) Shells are filled with electrons according to formula 3n3.
Answer: False
5) The valency of element can be determined from it’s electronic configuration
Answer: True
6) Positively charged constituent of atom is:
Answer: Proton
7) Negatively charged constituent of atom is:
Answer: Electron
8) Neutrally charged constituent of atom is:
Answer: Neutron
9) The core of atom is called:
Answer: Nucleus
10) Path followed by electron is:
Answer: shell
11) Sub atomic particle having negligible mass is:
Answer: electron
12) Particles of atom having similar size are:
Answer: proton and neutron
13) Most of the volume of an atom is occupied by:
Answer: electrons
14) Particles in an atom which are equal in number are:
Answer: protons & electrons
15) The particle found moving around the nucleus is:
Answer: electron
16) Nucleus of an atom is electrically neutral.
Answer: False
17) When electron jumps to a higher orbit it:
Answer: absorbs energy
18) K shell can hold ___ electrons.
Answer: 2
19) L shell can hold ___ electrons.
Answer: 8
20) M shell can hold ___ electrons.
Answer: 18
21) N shell can hold ___ electrons.
Answer: 32
22) According to Bohr each shell of atom can hold ____ electrons
Answer: 2n2
23) Number of bonds that an atom can form depends on its valency.
Answer: True
24)Valence electrons are ____ electrons.
Answer: outermost
25) A positively charged ion is called:
Answer: cation
26) A negatively charged ion is called:
Answer: anion
27) If an atom loses an electron it becomes
Answer: cation
28) If an atom gains an electron it becomes
Answer: anion
29) Atomic number of “X” is 12, mass number is 26, so number of neutrons is:
Answer: 14
30) How many times is a proton heavier than an electron?
Answer: 1840
31) Beta particles are a stream of-
Answer: electrons
32) Same chemical property but different physical property and mass number
Answer: isotopes
33) A particle “X” has 10 protons, 9 electrons and 12 neutrons. Its mass number is?
Answer: 22
34) An element has 5 protons, 5 electrons and 6 neutrons. Its mass number is?
Answer: 11
35) An element has 5 protons, 5 electrons and 6 neutrons. Its atomic number is?
Answer: 5
36) An element has 12 protons, 12 electrons and 14 neutrons. Its mass number is?
Answer: 26
37) An element has 12 protons, 12 electrons and 14 neutrons. Its atomic number is?
Answer: 12
38) The atomic number of a cation M+2 is 20. How many electrons does it have?
Answer: 18
39) The atomic number of a cation M+3 is 13. How many electrons does it have?
Answer: 10
40) An atom has 13 protons and 15 neutrons. What will be number of electrons?
Answer: 13
41) An atom has 6 protons and 8 neutrons. What will be the number of electrons?
Answer: 6
42) An atom has 6 protons and 8 neutrons. What will be its mass number?
Answer: 14
43) The atomic number of a cation M+2 is 12. How many electrons does it have?
Answer: 10
44) An atom with mass number of 27 has 14 neutrons. The number of electrons is?
Answer: 13
45) An atom with 3 protons and 4 neutrons will have a valency of-
Answer: 1
46) An atom with 4 protons and 4 neutrons will have a valency of
Answer: 2
47) An atom with 9 protons and 9 neutrons will have a valency of-
Answer: 1
48) An atom with 8 protons and 9 neutrons will have a valency of
Answer: 2
49) An atom with 10 protons and 10 neutrons will have a valency of
Answer: 0
50) An atom with mass number of 35 has 18 neutrons. The number of electrons is?
Answer: 17
51) An atom with mass number of 24 has 12 neutrons. The number of electrons is?
Answer: 12
52) An atom with mass number of 40 has 20 neutrons. The number of electrons is?
Answer: 20
53) The atomic number of an atom is the number of ?
Answer: Protons
54) The atomic mass is equal to the total number of
Answer: protons + neutrons
55) When you change the number of electrons in an atom you get a different
Answer: ion
56) An element is determined by its number of
Answer: protons
57) When you change the number of neutrons in an atom you get a different
Answer: isotope
58) When you change the number of protons in an atom you get a different
Answer: element
59) An atom with an electronic configuration of 2,8,1 will have a valency of
Answer: 1
60) An atom with an electronic configuration of 2,7 will have a valency of
Answer: 1
61) An element has 7 protons, 7 electrons and 7 neutrons. Its mass number is?
Answer: 14
62) An element has 7 protons, 7 electrons and 7 neutrons. Its atomic number is?
Answer: 7
63) An element has 9 protons, 9 electrons and 10 neutrons. Its mass number is?
Answer: 19
64) An element has 9 protons, 9 electrons and 10 neutrons. Its atomic number is?
Answer: 9
65) The atomic number of a cation M+4 is 22. How many electrons does it have?
Answer: 18
66) The atomic number of a cation M+3 is 15. How many electrons does it have?
Answer: 12
67) The atomic number of an anion M-2 is 8. How many electrons does it have?
Answer: 10
68) The atomic number of an anion M-2 is 16. How many electrons does it have?
Answer: 18
69) The atomic number of an anion M-3 is 7. How many electrons does it have?
Answer: 10
70) The atomic number of an anion M-3 is 15. How many electrons does it have?
Answer: 18
71) The atomic number of an anion M-1 is 17. How many electrons does it have?
Answer: 18
72) The atomic number of an anion M-1 is 35. How many electrons does it have?
Answer: 36
73) An atom with mass number of 31 has 16 neutrons. The number of electrons is?
Answer: 15
74) An atom with mass number of 23 has 12 neutrons. The number of electrons is?
Answer: 11
75) An atom with mass number of 80 has 45 neutrons. The number of electrons is?
Answer: 35
Questions on Periodic Table
- Which is electron arrangement of an alkali metal?
Answer: 2,8,1
2) Which is electron arrangement of a halogen?
Answer: 2,7
3) The element Argon belongs to which group?
Answer: Noble gases
4) The symbol for Potassium is
Answer: K
5) The symbol for Lithium is
Answer: Li
6) The symbol for Chlorine is
Answer: Cl
7) What is the name of the element with symbol ‘S’
Answer: Sulphur
8) What is the name of the element with symbol ‘Na’
Answer: Sodium
9) Which side of the periodic table do you find metals?
Answer: left
10) Which side of the periodic table do you find halogens?
Answer: right
11) In the periodic table, elements are arranged in order of their increasing:
Answer: atomic number
12) Hydrogen can lose electron, gain electron or share electron to form bond.
Answer: True
13) Metals ____ electrons to become stable.
Answer: loose
14) Elements with 1, 2 or 3 electrons in their valence shell are ____.
Answer: metals
15) Elements with 5,6,7 electrons in their valence shell are ____.
Answer: non metals
16) Non metals ____ electrons to become stable.
Answer: gain
17) Transitions elements have variable valency.
Answer: True
18) Electro positivity is ability to form:
Answer: positive ions
19) Atoms which show more than one valency are called:
Answer: Transition metals
20) Which of the following is a not transition metal?
Answer: sulphur
21) In a periodic table the elements present in the same group have:
Answer: same valency
22) The number of valence electrons present in magnesium is:
Answer: 2
23) What remains the same in a period?
Answer: number of shells
24) What remains the same in a group?
Answer: number of outer electrons
25) Magnesium belongs to _____ group?
Answer: Alkaline earth metals
26) Electronegativity refers to the energy required
Answer: to attract an electron
27) Ionization Energy refers to the energy required
Answer: to remove an electron
28) Which group is least reactive?
Answer: noble gases
29) Alkali metals have how many electrons in their outermost orbit?
Answer: 1
30) Alkaline earth metals have how many electrons in their outermost orbit?
Answer: 2
31) The most stable of all elements are:
Answer: noble gases
32) The horizontal rows in the periodic table are known as:
Answer: periods
33) The vertical columns in the periodic table are known as:
Answer: groups
34) Elements that have properties of both metals and non metals are:
Answer: metalloids
35) The element with atomic number 12 is
Answer: magnesium
36) What is the name of the element with symbol ‘Be’?
Answer: Beryllium
37) What is the name of the element with symbol ‘Mg’?
Answer: Magnesium
38) What is the name of the element with symbol ‘Si’?
Answer: Silicon
39) The element with atomic number 6 is:
Answer: carbon
40) The element with atomic number 20 is:
Answer: calcium
41) The lightest halogen is:
Answer: fluorine
42) The element with atomic number 15 is:
Answer: phosphorous
43) The element with atomic number 18 is:
Answer: argon