Location Period Group

How many valence electrons are in an atom of each element in Group 15 in the periodic table?

• 5

• 10

• 15

• 20

Answer explanation

The 5 in 15 gives you the number of valence electrons.

Tags

NGSS.MS-PS1-1

An element has a metallic-grey appearance. It also has the properties of both a metal and a nonmetal. In which section of the periodic table indicated in the illustration would the element most likely be found?

• 1

• 2

• 3

• 4

Answer explanation

"Metalloids are found on the zig-zag line"

Tags

NGSS.MS-PS1-1

The students had to use the information on the flash card to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in locations that match the information on the flash card.

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Answer explanation

Metals on the right!!!!!

Students were asked to identify the location of elements in the periodic table based on clues printed on game cards. Based on the data, which periodic table shows the correct location of the four elements?

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Answer explanation

The number of valence electrons identifies the group while the number of energy levels identifies the period.

Tags

NGSS.MS-PS1-1

Which pair of properties describes the elements in Group 18?

• They are chemically stable and liquid at room temperature.

• They have eight valence electrons and are flammable.

• They are magnetic and boil at low temperatures.

• They are gaseous at room temperature and chemically stable.

Answer explanation

The elements of Group 18 are nonreactive (chemically stable) gases.

Which table has the correct information about each element?

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Answer explanation

Your answer must match the information on the periodic table.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Which pair of properties describes the elements in Group 18?

• They are chemically stable and liquid at room temperature.

• They have eight valence electrons and are flammable.

• They are magnetic and boil at low temperatures.

• They are gaseous at room temperature and chemically stable.

Element R and Element Q have the same number of valence electrons. These elements both have similar chemical behavior, but Element R has fewer energy levels than Element Q. Which statement best describes the positions of the two elements in the periodic table?

• The two elements are in the same group, with Element Q at the top of the group and Element R at the bottom.

• The two elements are side by side in the same period, with Element Q to the left of Element R.

• The two elements are in the same group, with Element R just above Element Q.

• The two elements are in the same period, with Element R the first element in the period and Element Q the last element.

Tags

NGSS.MS-PS1-1

How many valence electrons are in an atom of each element in Group 15 in the periodic table? (answer should be a number only: example- 8)

Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, a nonmetal, or a metalloid. Which table was completed correctly?

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