Valence Electrons and Protons

Which statement best explains why protons are used to identify an element?

• Protons are the most easily identified subatomic particles

• Positive charges are more easily detected during an investigation than negative and neutral charges

• The number of protons is unique to each element and remains constant

• Protons alone cannot be used to identify an element. The number of electrons and neutrons must also be known.

A group of students examines a Bohr model of an atom with 8 valence electrons. What conclusion can the students make about the chemical reactivity of the element?

• The element is extremely reactive because the outer energy level is full

• The element is nonreactive because the outer energy level is full

• The element is somewhat reactive because the outer energy level is full

• Additional information is necessary to determine reactivity

Which area would be most useful in determining the identity of an element?

• Area 1

• Area 2

• Area 3

• Area 4

Tags

NGSS.MS-PS1-1

Which statement is NOT accurate describing the element krypton?

• The element has 36 protons

• The element has 48 neutrons

• The element has 6 valence electrons

• The element has properties similar to neon

Tags

NGSS.HS-PS1-1

How many valence electrons does carbon have?

• 4

• 5

• 6

• 7

Tags

NGSS.MS-PS1-1

How many valence electrons are in an atom of Ar?

• 2

• 8

• 4

• 1

What are valence electrons?

• The total number of electrons in an atom

• The number of electrons in the outermost shell

• The number of electrons in the second shell

• The number of protons in the outermost shell

How many valence electrons does Phosphorus have?

• 31

• 5

• 15

• 4

How many valence electrons are found in atoms of group 1?

• 7

• 6

• 4

• 1

How many Valance electrons does Iodine Have?

• 6

• 16

• 7

• 17

Tags

NGSS.MS-PS1-1