They all have the same number of energy levels. That's about it.
All member of the same period share the same number of energy levels. The energy levels range from one up to seven.
Atoms of nonmetals tend to be smaller than atoms of metals in the same period.
same no of protons
They are the same
Three electrons in their valency orbit.
Atoms in the same row of the periodic table, known as a period, share the same number of electron shells. This means they have the same principal energy level, which affects their size and ionization energy. However, they differ in the number of protons and electrons, leading to variations in their chemical properties. As you move across a period from left to right, elements typically become more electronegative and exhibit increased metallic character.
bromine, i think
They have similar properties as well as levels of reactivity
number of valence electrons
they have the same energy levels
The period number is the same as the highest energy level containing electrons for the atoms in that period.
Their valence electrons are in the same energy level.