Question

if a -1 ion has 10 electrons, what element is it? neon (ne) sodium (na) fluorine (f) oxygen (o)

Explanation:

Step1: Determine the number of electrons in the neutral atom

An ion with a charge of -1 has gained 1 electron. If the ion has 10 electrons, then the neutral atom has \(10 - 1=9\) electrons.

Step2: Relate the number of electrons in the neutral atom to the atomic number

In a neutral atom, the number of electrons is equal to the atomic number. So the atomic number of the element is 9.

Step3: Identify the element based on the atomic number

Looking at the periodic table, the element with atomic number 9 is fluorine (F).

Answer:

fluorine (F)