Question

I have three questions i need help answering lol
1.On the periodic table, what is a period? What characteristic is shared by elements in the same period?
2. On the periodic table, what is a group? For the main groups, what characteristic do the elements have in common?
3.Look at the periodic table listing ionic radii trends. Why are the radii changing as you move down the table within one column? Why are the radii changing as you move across the table from left to right within one row?

Answer 1

nvm i figured it out lol