How many al3+ ions are in a mole of albr3?

is a neutral molecule. which means the sum of oxidation numbers of all atoms is zero  Bromine has a charge of -1. There are 3Br atoms that are added on to give a neutral charge of 0.

atom+ atoms produce an electrically neutral salt.

This means there is only one needed to form the salt.

The number of ions in given compound is

Explanation:

We are given:

A chemical compound having chemical formula

It is an ionic compound. This compound is formed by the complete transfer of electrons from 1 atom to another atom. The cation is formed by the loss of electrons by metals and anions are formed by gain of electrons by non metals.

It is formed by the combination of 1 aluminium ion and 3 bromine ions.

According to mole concept:

1 mole of an ionic compound contains number of ions.

So, 1 mole of will contain number of aluminium ions

Hence, the number of ions in given compound is

1. they vary with a higher number because boiling is way hotter than melting

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.