Physical Science 1.1

In the modern periodic table, elements are arranged by

• atomic mass.

• atomic number (number of protons).

• number of valence electrons.

• number of isotopes.

What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Protons and electrons

• DNA and RNA

• Protons only

Isotopes of an element all have different numbers of

• protons.

• neutrons.

• electrons.

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NGSS.MS-PS1-1

Which statement is TRUE?

• This is a Bohr model representing helium.

• This is a negatively charged ion.

• This is a neutral atom.

• The atom has two valence electrons.

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How reactive is this atom?

• Very reactive because it has a full valence shell

• Unreactive because it has a full valence shell

• Very reactive because it doesn't have a full valence shell

• Unreactive because it doesn't have a full valence shell

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NGSS.MS-PS1-2

What do beryllium (Be), magnesium (Mg), and calcium (Ca) have in common?

• They all need 2 more valence electrons to become stable.

• They all have 2 energy levels surrounding the nucleus.

• They are all alkaline earth metals.

• They are all halogens.

• They are all gases at room temperature.

Which particles determine how reactive an atom is?

• Protons

• Neutrons

• Inner electrons

• Valence electrons

What happens when potassium (group 1) reacts with a nonmetal?

• It becomes an ion with a charge of +1.

• It becomes an ion with a charge of -1.

• It becomes an ion with a charge of +7.

• It becomes an ion with a charge of -7.

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How many valence electrons does an oxygen atom have?

• 2

• 6

• 7

• 8

• 4

What happens when sulfur (group 16) reacts with a metal?

• It accepts 2 electrons from the metal.

• It donates 2 electrons to the metal.

• It accepts 6 electrons from the metal.

• It donates 6 electrons to the metal.

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