Question

write atomic 20 and mass number of elements till 20​

Answer 1

Answer:

The elemenents of the periodic table sorted by atomic mass

Atomic Mass Name chemical element number

35.453 Chlorine 17

39.0983 Potassium 19

39.948 Argon 18

40.078 Calcium 20,

Chemistry : List of Periodic Table Elements Sorted by: Atomic number

No. Atomic Weight Electron configuration

17 35.453 [Ne] 3s2 3p5

18 39.948 [Ne] 3s2 3p6

19 39.098 [Ar] 4s1

20 40.078 [Ar] 4s2

Explanation:

Hydorgen, oxygen, fluorine, neon, sodium, magnesium,aluminum, nitrogen, titanium, tungsten, tantalum, osmium, bismuth, copper, iron, galium, iridium, francium, helium, and caesium. ... Helium-He. Lithium-Li. Beryllium-Be.