Interim review

Why do noble gases almost never form chemical bonds?

• a) They are very rare.

• a) They have very small atomic radii.

• a) They have filled valence electrons shells.

• It is difficult for gases to form bonds.

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Which of these statements is true?

• Metals tend to lose electrons and form positive ions.

• Nonmetals tend to lose electrons and form positive ions.

• Metalloids do not form compounds readily.

• Gases share electrons and form positive ions.

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Different isotopes indicate that an element will have different numbers of ____.

• atoms.

• protons.

• neutron

• electrons

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One property of an electron is ____.

• a net charge of 0.

• a net charge of +1.

• a net charge of -1.

• an atomic mass of

Which statement explains the difference between a proton and neutron?

• Both are found in the nucleus of the atom.

• Protons have a mass of 1 amu and neutrons have a mass of 2 amu.

• Protons have a positive charge and neutrons have a neutral charge.

• Protons are found in the outer energy levels of the atom, and neutrons are found in the nucleus.

What do we definitely know about an atom of magnesium, the element following sodium in the periodic table?

• Magnesium is more reactive than sodium.

• Magnesium contains more protons than sodium.

• Sodium has more valence electrons than magnesium.

• Magnesium always contains more protons and neutrons than sodium.

Refer to your periodic table. Which of these elements would you expect to be solid at room temperature?

• N

• O

• Ca

• Rd

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Locate the following four elements in the periodic table: Fe, Hg, Sn, Xe. Which element has the most valence electrons?

• Na

• Hg

• Sn

• Xe

Identify the atomic number of the most common isotope of the element in the image.

• 25

• 29

• 30

• 55

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NGSS.MS-PS1-1

As you move from left to right across a period of elements in the periodic table, what happens to the number of neutrons in a typical atom?

• It stays the same.

• It increases.

• It decreases.

• It decreases until you reach the middle and then it increases.