In an ionic bond, select one:
a. atoms, having gained or lost electrons, attract one another with opposite charges.
b. two atoms are attracted by the same charges.
c. atoms attract each other by sharing electrons to fill their valence shells.
d. two atoms are attracted by partial positive and negative charges.
e. two atoms both become strongly electronegative and attract each other.

A

Explanation:

B - Can't be - Ionic bonds are formed by oppositely charged ions

C - Can't be - This is a covalent bond

D - Can't be - This is an induced dipole or a van Der waals attraction

E - This is a permanent dipole dipole attraction

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.