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4vir4ik [10]
3 years ago
9

Please help as fast as u can

Chemistry
2 answers:
pav-90 [236]3 years ago
6 0

Answer:D

D

DDD

DDDDDDDDDD

Explanation:

sveticcg [70]3 years ago
6 0

Answer:

C. 1 and 3 only

Explanation:

In this element representation';

The superscript (23) s the mass number. Mass Number = Protons + Neutrons

-The subscript (11) is the atomic number.

Atomic Number = Protons

This means;

Number of Protons = 11

Number of Neutrons = 23 - 11 = 12

Number of electrons = 11 (Since it is a neutral atom)

Also sodium belongs to group 1 hence number of outer electrons = 1

The correct option is;

C. 1 and 3 only

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