covalent bonds and ionic bonds?

Question

1. Which of the following pairs of atoms are most likely to form covalent bond?
A. oxygen (O) and nitrogen (N)
B. oxygen (O) and magnesium (Mg)
C. oxygen (O) and krypton (Kr)

2. Which of the following pairs of atoms are most likely to form ionic bonds?
A. oxygen (O) and nitrogen (N)
B. oxygen (O) and magnesium (Mg)
C. oxygen (O) and krypton (Kr)

3. does (O2) have a nonpolar bond?

Answer 1

>First question:
The most likely covalent bond (stable linking between two orbits sigma type) is most likely between magnesium and oxigen, forming magnesium oxyde, which is a covalent stable compound, not solube in wather.
Second question:
The combination of oxygen and nitrogen will produce a non stable, non covalent ionic bonds ( they form nitrous NO2 Nitric NO anhydrides, and in water NO2 or nitrous anhydrid, will form nitric acid,(HNO3) that will dissociate ionically when dissolved in water in NO2 + HO- ( you can see the ionic bond)
Question 3:
O2 is a molecule of oxygen existing normally in nature and air. with two atoms of oxygen joined by non polar bond, (only electronic bond) and when this binding is broken, they form short lived (milliseconds) of two atoms of free oxygen, which are very reactive (the so called "nascent" oxygen) that behaves like a free radical. (that is why oxygenated water or hydrogen peroxyde kills bacteria)

By the way, krypton and the other noble gases such as argon neon, xenon, never form bindings with other atoms because they have the external orbit or "crown" complete with 8 electrons.
They can not combine with any other element to form compounds. Hence the odd term of "Noble gases"

Cheers good luck

Answer 2

1-A
2-B
3- O2 as a molecule is a nonpolar bond because they are 2 oxygen which means that the electronegativity of both is the same, which means there is a nonpolar bond between this oxygen atoms- so the answer is YES

Answer 3

Some general hints that will help you
1. Metal + NonMetal=ionic bond
2. NonMetal + Nonmetal=covalent bond
3. When deciding if a compound is polar, decide if any element in the compound is more electronegative than any other element. Then consider its 3D shape...do the locations of the more electronegative elements 'cancel' eachother out.

Answer 4

1. A
2. B
3. No, it does not. It is a covalent compound.

Answer 5

1 ) answerA

2)B

3) yes