SCIENCE 9 Q2 - REVIEW

On the basis of Rutherford’s model of an atom, which subatomic particle/s is/are present in the nucleus?

• neutron and electron

• proton and electron

• proton and neutron

• proton only

Who proposed a model of an atom and believed the idea of quantum theory to describe atomic structure, where electrons orbit the nucleus in specific energy levels or shells?

• John Dalton

• Neils Bohr

• Democritus

• J.J. Thompson

The fixed energies that the electrons have are called

• atomic orbitals

• electronic configuration

• energy levels

• orbits

Electrons are arranged around the nucleus of an atom in distinct energy levels, subshells (s, p, d, f), and orbital. This kind distribution of electrons is called

• atomic orbitals

• electron configuration

• energy level

• orbits

How many electrons can d subshell hold

• maximum of 2 electrons

• maximum of 6 electrons

• maximum of 10 electrons

• maximum of 12 electrons

What do call the measure of the tendency of an atom to attract electrons?

• electronegativity

• electron affinity

• ionization energy

• metallic character

What does a covalent bond consist of?

• a shared electron pair

• a shared electron

• an octet of electrons

• three different ions

How many valence electron connotes that the atom is stable?

• 2

• 4

• 6

• 8

What type of bond is formed by sulfur dioxide (SO₂)? (electronegativity values:

sulfur = 2.58; oxygen = 3.44)

• ionic bond

• metallic bond

• polar covalent bond

• nonpolar covalent bond

What type of bond is formed when there is complete transfer of electrons?

• ionic bond

• metallic bond

• polar covalent bond

• nonpolar covalent bond