Question

Consider the following statements:
(a) $\frac{e}{m}$ ratio of particles of canal rays remains constant
(b) The energy of orbit closest to nucleus is lowest
(c) $C{l}^{-}$ has 18 electrons and 18 protons
(d) The maximum number of electrons in an energy level is equal to $2n^2$
Which of the above statement(s) is/are correct?

• A. Only (b)
• B. (a), (c) and (d)
• C. (b) and (d)
• D. (b), (c) and (d)

Answer 1

Answer: (C)

(b) and (d)

(a) $\frac{e}{m}$ ratio of particles of canal rays depends on the gas in the discharge tube.
(b) The energy of orbit closest to nucleus is lowest. Energy goes on increasing as stationary level goes farther from the nucleus.
(c) Cl− has 18 electrons and 17 protons.
(d) The maximum number of electrons in an energy level is equal to $2n^2$. Also, the maximum number of electrons in a given sub-shell is given by $2(2l+1)$.