Each element in the periodic table is assigned an atomic number. this number is the same as?

Number of protons inside the nucleus.

Explanation: The atomic number is indicated by the amount of positively charged particles in the nucleus of an atom and these positively charged subatomic particles are protons.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

i just learnt this recently but i need to look through my notes again