22-23 8th Grade Science 1st 6 Weeks Review

Front

Lithium has 3 Protons, 3 Electrons, and 4 Neutrons. Which Bohr Model represents Lithium?

Back

Front

Which element (atom) is explained in the chart? Options: Radon (Rn), Cadmium (Cd), Rubidium (Rb), Astatine (At)

Back

Rubidium (Rb)

Front

Based on these drawings, which is the LEAST reactive? Options: Neon, Chlorine, Gallium, Tin

Back

Neon, because it has 2 energy levels with 8 electrons in the 2nd level.

Front

Which 2 atoms are of elements in the same group? Options: Atom 1 and 2, Atom 1 and 4, Atom 2 and 3, Atom 3 and 4

Back

Atom 1 and 4

Front

Which student's responses are correct? Options: Student 1, Student 2, Student 3, Student 4

Back

Student 2

Front

How many protons, neutrons, and electrons are present in the atom of Hafnium, Hf, with a mass number of 178?

Back

72 Protons, 106 Neutrons, 72 Electrons

Front

Element R and Q have the same number of Valence Electrons. These elements both have similar chemical behavior, but Element R has fewer energy shells. Which statement best describes the positions of the 2 elements on the Periodic Table?

Back

The two elements are in the same group, with Element R just above Element Q.

Front

What is the mass number of a potassium (K) atom that has 20 neutrons?

Back

39

Front

Which pair of elements would have the same number of valence electrons? Options: Lithium and Beryllium, Magnesium and Sodium, Lithium and Sodium, Magnesium and Lithium

Back

Lithium and Sodium

Front

Which element has the greater reactivity: Argon (Ar) or Calcium (Ca)?

Back

Ca is more reactive than Ar because it has 2 valence electrons