8.5 A

Chemical property

• A property of a substance relating to its appearance

• a property of a substance relating to its chemical reactivity

• When an atom owns chemicals

• When an atom changes color

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How would you describe the nucleus of an atom?

• dense, positively charged

• large, positively charged

• tiny, negatively charged

• dense, negatively charged

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NGSS.HS-PS1-8

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.

Which of the following best describes a proton? Select two correct answers.

• It has a negative charge and about the same mass as an electron.

• It has a negative charge and about the same mass as a neutron.

• It has a positive charge and about the same mass as a neutron.

• It has a positive charge and is located outside the nucleus.

• It has a positive charge and is located inside the nucleus.

What are the negatively charged particles in an atom called?

• protons

• neutrons

• nuclei

• electrons

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

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