Question

When uredt
The atom of an element has a 9 protons
q9electrons and neutrons
What is the atomic no. of the element?
Predict the valency of the element ?
What is the mass no. of the element ?​

Answer 1

Atomic no. of the element ----> 9 which is Fluorine

Valency of the element ----> ( -1 )

Mass no. of the eelement -----> 19

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Answer 2

Answer:

The atomic number is 9.

The valency of the element is -1(+1).

The mass number of of the element is 18.

Explanation:

Because this is the element of fluorine.