4.7 is the answer!
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An ionic bond is formed by the transfer of electrons from one atom to the other. It is usually formed between a metal + non-metal.
A covalent bond is formed by sharing of electrons between two atoms. It is formed between two nonmetals. A polar covalent bond is formed between 2 non-metals which differ in their electronegativities. In contrast, in a non-polar covalent interaction the two atoms could either be the same or have very close electronegativities.
1) P and I : Both non-metals with different electronegativities= Polar Covalent
2) Fe and O: Metal + non-metal = Ionic
3) S and Cl: Both non-metals with different electronegativities= Polar Covalent
4) S and S: Both non-metals and the same atoms = Non-polar Covalent
5) Br and Br: Both non-metals and the same atoms = Non-polar Covalent
6) O and Cl: Both non-metals with different electronegativities= Polar Covalent
7) Be and Cl: Metal + non-metal = Ionic
8) Al and N: Metal + non-metal = Ionic
Because Na has one too many electron to be stable, while Mg has 2. once they loose those electrons, they will be come ion. loosing one electron will give the ion a 1+ charge, and loosing 2 will create a 2+ charge
The correct answer is a rodent that sleeps underground during day
A desert rodent such as kangaroo rat well adapted to live in dessert. It can survive without drinking water. Rodents make underground burrows at the base of shrub or small bush. It spends most of its day sleeping in the burrow underground to avoid intense heat and comes out to feed at night when temperature falls and desert becomes cooler.
Answer: 1.Flint 2.Minerals are found in the earth's crust in ores and in rocks. They are found everywhere in the world and are mined at designated places referred to as mines all over the world.
Explanation: