The missing components in the table to the right
are indicated with orange letters. use the periodic
table in the tools bar and this link web elements
to fill in the corresponding values
element
electron
affinity
(kj/mol)
electro-
negativity
bromine
324.6
2.96
chlorine
magnesium
sodium
52.8

Hey I dont know it but good luck!! :)

Explanation:

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

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.