Question

1. which of the following can be formed when there is electron transfer between metals and non - metals?

a. molecule
b. element
c. ionic bond
d. covalent bond

1. which of the following is formed due to the sharing of electrons between two non - metals?
2. a molecule
3. a covalent bond
4. a covalent compound

a. i and ii only
b. i and iii only
c. ii and iii only
d. i, ii, and iii

1. water is a(n)

a. element
b. polyatomic ion
c. ionic compound
d. covalent compound

1. sodium chloride is a(n)

a. element
b. polyatomic ion
c. ionic compound
d. covalent compound

1. which of the following can be formed when a non - metal atom reacts with a non - metal atom?

a. element
b. polyatomic ion
c. ionic compound
d. covalent compound

Explanation:

Question 7

When electrons transfer between metals (which lose electrons) and non - metals (which gain electrons), ions are formed, and the electrostatic attraction between these ions forms an ionic bond. A molecule is formed by covalent bonding (sharing of electrons), an element is a pure substance made of one type of atom, and a covalent bond involves sharing electrons (not transfer). So the correct answer is the option related to ionic bond.

• When two non - metals share electrons, they form a covalent bond. A group of atoms held together by covalent bonds forms a molecule. A compound formed by covalent bonds (sharing of electrons between non - metals) is a covalent compound. So I (a molecule), II (a covalent bond), and III (a covalent compound) are all formed due to the sharing of electrons between two non - metals.

Water ($H_2O$) is made up of hydrogen and oxygen atoms that share electrons (covalent bonding). An element is a pure substance with one type of atom, a polyatomic ion is a charged species made of multiple atoms, and an ionic compound is formed by ionic bonding (transfer of electrons, usually between a metal and non - metal). So water is a covalent compound.

Answer:

C. ionic bond

Question 8