Question

The position of which elements is still not clear (uncertain) in periodic table not even in modern periodic

table

a. Sodium
b. Magnesium
c. Hydrogen
d. Argon​

Answer 1

Answer:

c

Explanation:

jzhdn

$3 \sqrt{2}$

Answer 2

answer is hydrogen (c)

because because hydrogen is uncertain in periodic table and modern table.