Instructions: Classify the following properties as either lonic or Covalent compounds. Write ionic or covalent on the space before each property. 4. Atoms share electrons to become stable.
5. High melting and boiling points
6. Conduct electricity when melted
7. Usually occurs between non-metals.
8. Poor electrical conductors in all phases
9. Many soluble in non-polar liquids but not in water
10. Crystalline solids (made of ions)
11. Metal atoms give electrons while non metal atoms get electrons to become stabl
12. Usually occurs between metals and non-metals.
13. Hydrogen and another non-metal chemically combines through covalent bonding.
14. Low melting and boiling points
15. Many soluble in water but not in non-polar liquid​

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.  

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.