Question

Q. Ca has atomic number 20 and atom weight 40.
Which of the following statements is not correct
about Ca atom?
OPTIONS:-
(a) The number of electrons is same as the number
of neutrons.
(b) The number of nucleons is double of the
number of neutrons.
(c) The number of protons is half of the number of
neutrons.
(d) The number of nucleons is double of the atomic​

Answer 1

Number of Protons ⇒ Atomic number = 20

Neutrons ⇒ Atomic mass - number of protons

⇒ 40 - 20 = 20.

According to the statement the total number of protons should be half of the number of neutrons.. Which is wrong because after solving we are getting total number of protons = neutrons = 20

So statement (c) is not correct about Ca atom..

Answer will be (c) The number of protons is half of the number of neutrons.