The Chemical Symbol of Sodium is

Answer: Option C

1. Human bone does not contain

Answer: Option C

Explanation:

Human bone contains calcium, carbon, phosphorous.

Answer: Option B

Atomic radius of the elements increases as one moves down the first group of the periodic table
Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the
Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

Answer: Option C