$A$ sodium cation $(Na^{+})$ has a different number of electrons from:

Which of the following is isoelectronic with a carbon atom?

The atomic weight of an element is $39$. The number of neutrons in its nucleus is one more than the number of protons. The number of protons,neutrons,and electrons respectively in its atom would be

An element with mass number $181$ contains $32 \%$ more neutrons as compared to protons. What is the symbol of that element?

Which of the following atoms and ions are isoelectronic,i.e.,have the same number of electrons as the neon atom?

If the number of neutrons in $_{8}O^{16}$ is doubled and the number of electrons is halved,what is the percentage change in its mass?