Answer: Decreases across the period and increases down the group
Answer:
B is the answer because it doesn't matches the num of valence electrons
They start with the numbers u need to know in order to slove the problem and there has to be a story behind it
Answer:
An elementary particle that is identical with the nucleus of the hydrogen atom, that along with the neutron is a constituent of all other atomic nuclei, that carries a positive charge numerically equal to the charge of an electron.
Example:
The nucleus of a hydrogen atom or the H+ ion is an example of a proton. Regardless of the isotope, each atom of hydrogen has 1 proton; each helium atom contains 2 protons; each lithium atom contains 3 protons and so on.
