Question

Multiple Choice Questions

(a) The outermost shell of an atom is known as

(i) valency

(ii) valence electrons

(iii) nucleus

(iv) valence shell

(b) The number of valence electrons present in magnesium is

(i) two

(ii) three

(iii) four

(iv) five

(c) The sub atomic particle with positive charge is

(i) proton

(ii) neutron

(iii) electron

(iv) nucleon

(d) If the atomic number of an atom is 17 and mass number is 35 then number of neutrons will be

(i) 35

(ii) 17

(iii) 18

(iv) 52

(e) The number of electrons in an atom is equal to the number of

(i) protons in a neutral atom

(ii) neutrons in a neutral atom

(iii) nucleons in a neutral atom

(iv) none of the above

(f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

(i) mass number

(ii) atomic number

(iii) number of electrons

(iv) all of the above

Answer 1

(a) The outermost shell of an atom is known as
1. valency
2. valence electrons
3. nucleus
4. valence shell
Ans-2
(b) The number of valence electrons present in magnesium is
1. two
2. three
3. four
4. five
Ans--1
(c) The sub atomic particle with negative charge is
1. proton
2. neutron
3. electron
4. nucleon
Ans-3
(d) If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be
1. 35
2. 17
3. 18
4. 52
Ans-3
(e) The number of electrons in an atom is equal to number of
1. protons in a neutral atom
2. neutrons in a neutral atom
3. nucleons in a neutral atom
4. none of the above
Ans--1
(f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called
its
1. mass number
2. atomic number
3. number of electrons
4. all of the above
Ans-1