Question

Given the atomic

notation of 19/9 X, identify element X.
a fluorine
b neon
C potassium
d nickel

Answer 1

a

Step-by-step explanation:

its electron arrangements is 9

Answer 2

Answer: Choice A) fluorine

Step-by-step explanation:

The notation
`^(19)_9X` refers to some element X that has 9 protons and 19 protons and neutrons (so that means 19-9 = 10 neutrons). The element that has 9 protons is fluorine (symbol F on the periodic table)

This means
`^(19)_9X` would update to
`^(19)_9F`