8.5B Identifying an Element Review

An atom of which element is represented by this model?

• Neon

• Sodium

• Oxygen

• Carbon

Tags

NGSS.MS-PS1-1

An atom of which element is represented by this model?

• Neon

• Sodium

• Carbon

• Boron

Tags

NGSS.MS-PS1-1

The atoms of a certain element each contain 19 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?

• The element is Potassium and is not reactive.

• The element is Fluorine and highly reactive.

• The element is Potassium and highly reactive.

• The element is Flourine and not reactive.

The atoms of a certain element each contain 18 protons and 8 valence electrons. Which statement correctly identifies the element and its chemical reactivity?

• The element is Chlorine and is highly reactive,

• The element is Argon and is stable.

• The element is Argon and is highly reactive.

• The element is Chlorine and is stable.

Tags

NGSS.MS-PS1-1

What characteristics of an element's atoms always determine the elements identity?

• The number of valence electrons.

• The number of neutrons.

• The number of energy shells.

• The number of protons.

What characteristic of an element's atoms determines the element's identity?

• The number of protons.

• The number of subatomic particles.

• The number of valence electrons.

• The number of neutrons.