What is the formula of the compound formed between oxygen (o) and sodium (na)? ona, because oxygen gains one electron and sodium loses one electron. ona2, because oxygen gains two electrons and sodium loses one electron. na2o, because oxygen gains two electrons and sodium loses one electron. nao, because oxygen gains one electron and sodium loses one electron.

, because oxygen gains two electrons and sodium loses one electron.

Explanation:

is an ionic compound because sodium element is a metal which loses one electron to give and oxygen element is a non-metal which gains two electrons to give .

The bond formed between a metal and a non-metal is always ionic in nature.

The chemical formula of ionic compounds is given by:

1. Positive is written first.

2. The negative ion is written next.

Hence, the formula of sodium oxide is .

Option (c) is the correct answer.

Explanation:

The bottom of pencil is placed at the starting point of scale. Whereas the tip of pencil depicts the end point of its length.

The bottom of pencil is at 0 mm and tip of pencil is at 18.73 mm. The appropriate amount of significant figures is 18.73 mm.

Therefore, we can conclude that out of the given options, pencil is 18.73 mm long.