Answer:

1. Atomic number: 19

Atomic mass: 39.0983 u

Period: 4

Group 1: The alkali metals

2.Atomic mass: 35.453 u

Atomic number: 17

period: 3

Group 17 :halogens

3.Atomic mass: 15.999 u

Atomic number: 8

period: 2

group 16: chalcogens

4.Atomic mass: 1.00784 u

Atomic number: 1

period:1

group 1: A

5.Atomic number: 2

Atomic mass: 4.002602 u

period:1

group 8:noble gasses

Explanation:

inde kopo medyo naintindihan nyo pero sana po makatulong