Answer: decreases
Explanation:
Atomic radius in a period from left to right decreases due to increase in nuclear charge.
On moving from left to right, electrons are getting added in outer shell and no of protons also increased which results increase in nuclear charge. Increased nulcear charge holds the electrons tigthly hence electrons moves close to nucleus. So radius decreases.
Two properties of a star is luminosity and temperature.
I don’t even know I’m just answering for pints
0.2 m/s! keep in mind, speed= distance divided by time :D