Chemistry Periodic Trends

Elements in the same family have the same

• Atomic numbers

• Atomic masses

• Number of  valence electrons

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NGSS.HS-PS1-1

The periodic law states that there is periodic repetition of the physical and chemical properties of elements -___________________.

• if only metals are considered.

• when they are arranged in order of increasing atomic radii.

• when they are arranged in order of increasing atomic number.

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NGSS.HS-PS1-1

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How is the current periodic table organized?

• By increasing atomic number

• By increasing number of electrons

• By increasing atomic mass

A mystery element has 18 protons. Which one of the following statements is true about the element?

• The element belongs in row 2 of the periodic table and is classified as a halogen.

• The element belongs in row 3 of the periodic table and is classified as a noble gas.

• The element belongs in row 4 of the periodic table and is classified as an alkali metal.

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NGSS.HS-PS1-1

A vertical column in the periodic table is called a(n) __________________.

• Actinide

• Group

• Period

Which family in the periodic table does not react with any other family?

• Alkali Metals

• Alkaline Earth Metals

• Noble Gases (inert gases)

A horizontal row in the periodic table is called a(n)

• Group

• Period

• Family

Valence electrons are ____________________

• Electrons in the nucleus

• Electrons found on the inner shell

• Electrons found on the outer shell

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NGSS.HS-PS1-1

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All elements in column 17 of the periodic table have how many electrons in the outer shell?

• 1

• 2

• 7

• 17

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NGSS.HS-PS1-1

Choose the set of elements that have the same number of valence electrons

• Chlorine, Fluorine, Oxygen

• Fluorine, Chlorine, Iodine

• Lithium, Magnesium, Potassium

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NGSS.HS-PS1-1