8.5(A), 8.5(B), and 8.5(C) Standards Review

What are the negatively charged particles in an atom called?

• protons

• neutrons

• nuclei

• electrons

Tags

NGSS.MS-PS1-1

How would you describe the nucleus of an atom?

• dense, positively charged

• large, positively charged

• tiny, negatively charged

• dense, negatively charged

Tags

NGSS.MS-PS1-1

At the atomic level, what makes elements reactive?

• having a filled outer level

• exchanging or sharing valence electrons

• having the same number of electrons

• having the same number of protons

Look at the column, taken from the periodic table. Which of the following statements is correct for the elements shown?

• Lithium has 6.9 protons.

• Lithium has the least number of protons.

• Sodium has the most number of protons.

• Potassium has 39.1 protons.

Tags

NGSS.MS-PS1-1

An atom has 12 protons, 14 neutrons, and 12 electrons. What is the atomic number of this element?

• 24

• 26

• 12

• 38

Tags

NGSS.MS-PS1-1

Which of the following is true of properties of the elements in the same period of the periodic table?

• They are similar.

• They are not similar.

• They are identical.

• They have the same atomic mass.

The element sulfur (S) has an atomic number of 16, an atomic mass of 32.1, and is on the right side of the zigzag on the periodic table. Based on this information, to which class of elements does sulfur most likely belong?

• metals

• nonmetals

• metalloids

• solids

What is a vertical column of the periodic table called?

• group

• period

• energy level

• atomic number

The picture shows part of the periodic table. Which pair of elements are in the same period?

• La and Ru

• Ra and Sg

• Y and Os

• K and Mg

In general, elements in Group 18 (8A) do not form compounds. Which of the following explains why elements in Group 18 (8A) do not readily form compounds?

• These elements are very reactive.

• These elements have a full outermost energy level.

• These elements are within the same period.

• These elements have the same atomic number.