# Problem: A certain element has only two naturally occurring isotopes: one with 18 neutrons and the other with 20 neutrons. The element forms 1– charged ions when in ionic compounds. Predict the identity of the element. What number of electrons does the 1– charged ion have?

###### FREE Expert Solution

We’re being asked to predict the identity of the elemen and determine the number of electrons the 1– charged ion has.

An element can be represented as:

You can determine the identity of the element using its atomic number:

Atomic number (Z):

represents the identity of the element
reveals the number of protons
in a neutral element:

# of protons = # of electrons

Mass number (A)

reveals the number of protons and neutrons

mass number = # of protons + # of neutrons

Given:

80% (216 ratings)
###### Problem Details

A certain element has only two naturally occurring isotopes: one with 18 neutrons and the other with 20 neutrons. The element forms 1– charged ions when in ionic compounds. Predict the identity of the element. What number of electrons does the 1– charged ion have?