Question

1. choose the best answer.

an element that gains or loses an electron is a(n)______.
isotope
ion
positron
valence element

1. choose the best answer.

which statement is true about nitrogen gas, which is made of two elements of nitrogen chemically combined (n₂)?
it is a molecule.
it is a molecule and a compound.
it is a compound.

Explanation:

• For question 11: An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a charge. An isotope is an atom with the same number of protons but different number of neutrons. A positron is a positively charged electron. There is no such thing as a "valence element" in standard chemistry terms.
• For question 12: A molecule is a group of atoms bonded together. A compound is a substance formed when two or more different elements chemically combine. Since \(N_2\) is made of two nitrogen (same element) atoms bonded together, it is a molecule (not a compound as there is only one type of element).

Answer:

1. ion
2. It is a molecule.