फिटकरी रगड़ने से खून का बहना रुक जाता है, क्यों?
Bleeding stops by rubbing alum, why?​

any far is the region can control the climate

1.solid

2.carbon dioxide

3.helium

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8