Second Periodic Test in Science 9

According to the periodic table, phosphorus is an element with the atomic number 15 and an atomic mass of 31. By using this information, can you identify how many neutrons are present in a phosphorus atom?

• 14

• 16

• 18

• 20

Iron (Fe) is an element listed on the periodic table. Based on the information provided in the periodic table, determine the classification of iron according to its properties.

• Metal

• Non-metal

• Metalloid

• Noble gas

Determine the correct electron configuration for a nitrogen atom, considering its atomic number and position within the periodic table.

• 1s² 2s² 2p¹

• 1s² 2s² 2p³

• 1s² 2s² 2p⁶

• 1s² 2s² 2p⁵

Using the given electron configuration, identify the number of valence electrons in a sulfur (S) atom. The electron configuration of sulfur is 1s² 2s² 2p⁶ 3s² 3p⁴.

• 6

• 4

• 2

• 8

Which of the following best defines ionic bonding?

• The sharing of electrons between two atoms

• The bonding that occurs between molecules of water

• The formation of a bond between two nonmetal atoms

• The transfer of electrons from one atom to another, resulting in the formation of oppositely charged ions

Which of the following best defines covalent bonding?

• The attraction between oppositely charged ions

• The bonding that occurs in metallic elements

• The transfer of electrons from one atom to another

• The sharing of electrons between two atoms

Hydrocarbons are fundamental organic compounds essential in chemistry and everyday life. Based on this information, which statement best describes hydrocarbons?

• Compounds that can be found in fossil fuels

• Compounds consisting of hydrogen and oxygen atoms

• Molecules containing hydrogen, carbon, and nitrogen atoms

• Compounds composed exclusively of hydrogen and carbon atoms

Based on the periodic table, identify the number of protons, electrons, and neutrons in a fluorine atom (atomic number 9, atomic mass 19).

• Protons: 9, Electrons: 9, Neutrons: 9

• Protons: 9, Electrons: 9, Neutrons: 10

• Protons: 9, Electrons: 9, Neutrons: 11

• Protons: 10, Electrons: 9, Neutrons: 10

Refer to the periodic table and identify which of these elements is considered a non-metal.

• Copper (Cu)

• Magnesium (Mg)

• Nitrogen (N)

• Potassium (K)

Using the periodic table and your understanding of electron configurations, which of the following is the correct electron configuration for a phosphorus (P) atom?

• 1s² 2s² 2p⁶ 3s² 3p³

• 1s² 2s² 2p⁶ 3s¹ 3p⁶

• 1s² 2s² 2p⁶ 3s² 3p²

• 1s² 2s² 2p⁶ 3s² 3p⁴