2.º ESO - FyQ - Atom/bonds

Which type of chemical bond does potassium chloride have?

• Covalent (network)

• Metallic

• Ionic

• Covalent (molecular)

Answer explanation

Potassium chloride has an ionic bond, where potassium donates an electron to chlorine, resulting in the formation of positively and negatively charged ions that are held together by electrostatic forces.

What subatomic particles are found in the nucleus of an atom?

• Protons and neutrons

• Protons and electrons

• Neutrons and electrons

• Electrons and positrons

Answer explanation

The subatomic particles found in the nucleus of an atom are protons and neutrons.

Which type of bond involves the sharing of electrons between atoms?

• Ionic bond

• Covalent bond

• Metallic bond

• Hydrogen bond

Answer explanation

Covalent bonds involve the sharing of electrons between atoms, making them the correct choice in this question.

What is the charge of an atom that has lost two electrons?

• Positive

• Negative

• Neutral

• Variable

Answer explanation

An atom that has lost two electrons will have a positive charge due to having more protons than electrons, resulting in an overall positive charge.

Which type of intermolecular force is responsible for the attraction between molecules of water?

• London dispersion forces

• Dipole-dipole forces

• Hydrogen bonding

• Ionic bonding

Answer explanation

The correct type of intermolecular force responsible for the attraction between water molecules is hydrogen bonding.

What is the atomic number of carbon?

(a)  

An atom has 11 protons and 12 neutrons. What is its mass number?

• 11

• 12

• 23

• 24

Answer explanation

The mass number is the sum of protons and neutrons in an atom. Therefore, the mass number of the atom with 11 protons and 12 neutrons is 11 + 12 = 23.

In which type of bond do atoms transfer electrons to form ions?

• Covalent bond

• Metallic bond

• Ionic bond

• Hydrogen bond

Answer explanation

Atoms transfer electrons to form ions in an Ionic bond.

What's the atomic number of an atom with this electron configuration?

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁹

(a)  

Which type of bond is formed between a metal and a non-metal?

• Ionic bond

• Covalent bond

• Metallic bond

• Hydrogen bond

Answer explanation

A metal and a non-metal form an ionic bond where electrons are transferred from the metal to the non-metal, resulting in the formation of positively and negatively charged ions.