MI-Star 7.6

Which of the following properties uniquely identifies every element?

• Number of valence electrons

• Charge of the atom

• Number of neutrons

• Number of protons

• 2
• 8
• 3
• 13

Tags

NGSS.MS-PS1-1

All atoms are most stable with (or would "prefer") how many electrons in their valence shell?

• 1

• 2

• 8

• 18

• 2
• 6
• 10
• 16

Tags

NGSS.MS-PS1-1

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

• 6
• 7
• 8
• 9

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.

The model of the periodic table in the illustration shows the location of four elements. A student is asked to identify an element that is a pale yellow brittle solid that does not conduct electricity. At which location in this periodic table would the element most likely be found?

• 1

• 2

• 3

• 4

Answer explanation

"Nonmetals on the right"

A student is studying the ways different elements are similar to one another. The illustration contains diagrams of atoms from four different elements. Which two atoms are of elements in the same group in the periodic table?

• Atom 1 and Atom 2

• Atom 1 and Atom 4

• Atom 2 and Atom 3

• Atom 3 and Atom 4

Answer explanation

Elements in the same group (column) have the same number of valence electrons!!!

Tags

NGSS.MS-PS1-1

Element R and Element Q have the same number of valence electrons. The 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 period, with element R the first element in the period and Element Q the last element.

• 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 group, with Element Q at the top of the group and Element R at the bottom.

Answer explanation

Elements with the same number of valence electrons are found in the same group (column) or family!!!!

Tags

NGSS.MS-PS1-1