Arrange the following statements in a sequence which involves the calculation of the atomic number and mass number for an atom of an element with 15 electrons and 16 neutrons.
(a) A=Number of protons + Number of neutrons
A=Z+ Number fo neutrons
A=15+16=31
(b) Number of protrons and number of electrons are equal in a neutral atom. Hence the atomic number Z is equal to 15.
(c) Mass number is equal to the total number of protons and neutrons.
(d) Atomic number is 15 and mass number is 31.

Options

A. b d c a
B. b c a d
C. c b a d
D. c b d a

Answer

B

Explanation

(i) Number of protons and number of electrons are equal in a neutral atom. Hnce atomic number 'Z' is equal to 15.
(ii) Mass number is equal to the total number of protons and neutrons.
(iii) A = Number of protons + Number of neutrons
A = Z + Number of neutrons
A = 15 + 16 = 31
(iv) Atomic number is 15 and mass number is 31.