What can the group and period number tell us

Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.

Explanation:

Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period

Explanation:

can you mark me as Brainliest i need 4 more to rank up

i think   the answer is c hope i'm right

fe 55.85 g/mol and h2o 18.02 g/mol.