Question

a. Lithium and sodium are the most similar because they are both________ elements located in the same__________ , and therefore have similar properties.b. Nitrogen and oxygen are not the most similar because although they are both______ elements, are each located in a different________

Answer 1

Answer:

1a. monovalent or univalent

b. Group

2a. divalent

b. Different group

Explanation:

Answer 2

Answer:

Lithium and sodium are the most similar because they are both alkali elements located in the same group, and therefore have similar properties.

Nitrogen and oxygen are not the most similar because although they are both non metals elements, are each located in a different group

Explanation:

Li and Na are both alkali elements from group 1 that shares some similities. The both can be obtained by the  water hydrolysis. These are common reactions:

Metal from group 1 + H₂O → Base + H₂

Metal from group 1 + O₂ → oxides

Metal from group 1 + group 17 →  ionic halides

Both form cations with 1+ charge, they can release only 1 e-

N is an element from group 15 and O, from group 16. They are both non metal.

Nitrogen can make a variety of oxides.

They react in water to produce nitric acid:

N₂O₃ + H₂O → 2HNO₃

N₂O₅ + H₂O → 2HNO₃

It has an anion with -3, as oxidation state. (Nitride)

The N with H, makes a well known hidride → ammonia

N₂ + 3H₂ → 2NH₃

The Oxygen also makes a well known hidride → water

2H₂ + O₂ → 2H₂O

Both are covalent hidrides.

N can have many oxidation's states. O always acts with -2 except for the peroxydes, with -1. O can have a great power of oxidation, that N does not have.

O₂ always acts as a reactant, at combustion reactions.