More Practice for unit 1

Which subatomic particles are responsible for atomic mass?

• Electrons

• Protons

• Neutrons

• Positrons

Answer explanation

Atomic mass is primarily determined by protons and neutrons, as they are much more massive than electrons. Positrons are not typically present in stable atoms, so they do not contribute to atomic mass.

Which subatomic particles are responsible for the charge of an atom?

• Electrons

• Neutrons

• Nucleus

• Protons

Answer explanation

Protons and electrons are the subatomic particles responsible for the charge of an atom. Protons carry a positive charge, while electrons carry a negative charge, balancing the overall charge of the atom.

Which of the follow elements are in the Alkaline Earth metals?

• Mg

• Ca

• K

• Li

• Fr

Answer explanation

The Alkaline Earth metals are found in Group 2 of the periodic table. Magnesium (Mg) and Calcium (Ca) are both in this group, while Potassium (K), Lithium (Li), and Francium (Fr) are not.

Which of the following elements have 4 valence electrons?

• Carbon

• Bismith

• Oxygen

• Antimony

• Lead

Answer explanation

Carbon and Lead both have 4 valence electrons. Carbon is in group 14, while Lead, also in group 14, shares this characteristic. Bismuth, Oxygen, and Antimony do not have 4 valence electrons.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element's electron configuration is 1s² 2s² ...7s² 5f¹⁴ 6d⁹?

• Ag

• Cu

• Au

• Rg

Answer explanation

The electron configuration 1s² 2s² ... 7s² 5f¹⁴ 6d⁹ corresponds to the element Roentgenium (Rg), which has an atomic number of 111. The other options (Ag, Cu, Au) have different electron configurations.

Tags

NGSS.HS-PS1-1

Match the element to the group name?

• Iron

• Noble Gas

• Calcium

• Alkali Metal

• Bromine

• Alkaline Earth Metal

• Argon

• Halogen

• Sodium

• Transition Metal

Tags

NGSS.HS-PS1-1

Match the element to the group name?

• Krypton

• Halogen

• Tungsten

• Transition Metal

• Magnesium

• Noble Gas

• Potassium

• Alkali Metal

• Chlorine

• Alkaline Earth Metal

Tags

NGSS.HS-PS1-1

Match the number of valence electrons to the correct element

• 6

• Sodium

• 7

• Magnesium

• 2

• Chlorine

• 5

• Phosphorus

• 1

• Oxygen

Tags

NGSS.HS-PS1-1

Match the number of valence electrons with the correct element

• 6

• Sulfur

• 8

• Argon

• 2

• Calcium

• 7

• Bromine

• 3

• Aluminum

Tags

NGSS.HS-PS1-1

Which of the following atoms could be represented by the orbital diagram above?

• Ar

• O^2-

• F^1-

• K¹⁺

• Ga³⁺

Answer explanation

The orbital diagram corresponds to 18 electrons, which matches the electron configuration of Argon (Ar) and Potassium ion (K¹⁺), both having 18 electrons. The other options have different electron counts.

Tags

NGSS.HS-PS1-1