Question

an atom of an element has 7 electrons in its L shell.
A- what is its atomic number?
B-state its valency.
C- identify the element .

Answer 1

If an atom is having 7 electrons in its L or last shell, then,

1.Atomic number of the element is 9 (total number of electrons.)

2.The valency of the element is -1 (7-8= -1, valency- number of valence electrons- total number of electrons in the last shell).

3.The element if Fluorine.

Answer 2

Answer:

a. 9

b. -1

c. fluorine

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