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

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

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Tags

NGSS.MS-PS1-1

Which element (atom) is explained in the chart?

• Radon (Rn)

• Cadmium (Cd)

• Rubidium (Rb)

• Astatine (At)

Tags

NGSS.MS-PS1-1

Based on these drawings, which is the LEAST reactive?

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

• Chlorine, because it has 3 energy levels with 7 electrons in the 3rd level.

• Gallium, because it has 4 energy levels with 3 electrons in the 4th level.

• Tin, because it has 5 energy levels with 4 electrons in the 5th level.

Tags

NGSS.MS-PS1-1

Which 2 atoms are of elements in the same group?

• Atom 1 and 2

• Atom 1 and 4

• Atom 2 and 3

• Atom 3 and 4

Tags

NGSS.MS-PS1-1

Which student's responses are correct?

• Student 1

• Student 2

• Student 3

• Student 4

Tags

NGSS.MS-PS1-1

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

• 72 Protons, 178 Neutrons, 106 Electrons

• 72 Protons, 106 Neutrons, 72 Electrons

• 178 Protons, 250 Neutrons, 72 Electrons

• 106 Protons, 72 Neutrons, 106 Electrons

Tags

NGSS.MS-PS1-1

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.

• The two elements are in the same period, with Element R the first element in the period and Element Q the last element.

• The two elements are side by side in the same period, with Element Q to the left of Element R.

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

• The two elements are in the same group, with Element Q at the top of the group and Element R at the bottom.

Tags

NGSS.MS-PS1-1

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

• 18

• 19

• 20

• 39

A portion of the periodic table is shown below. Which pair of elements would have the same number of valence electrons?

• Lithium and Beryllium

• Magnesium and Sodium

• Lithium and Sodium

• Magnesium and Lithium

Argon has an atomic number of 18 and belongs in Group 18 on the periodic table. Calcium has an atomic number of 20 and belongs in Group 2 on the periodic table. Which element has the greater reactivity and why?

• Ar is more reactive than Ca because it has more energy shells

• Ca is more reactive than Ar because it has more energy shells

• Ar is more reactive than Ca because it has 8 valence electrons

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