Which subatomic particles are matched with their charges?

• Protons are positive and neutrons are negative.

• Protons are positive and electrons are negative

• Protons are negative and neutrons have no charge.

• Protons are negative and electrons have no charge.

Tags

NGSS.HS-PS2-4

Which conclusion directly resulted from the “gold foil experiment”?

• Atoms are mostly empty space.

• Atoms are hard, indivisible spheres.

• Electrons are located in shells.

• Electrons have a small mass.

The bright-line spectrum of an element is produced when excited-state electrons

• absorb energy and move to higher energy states

• absorb energy and move to lower energy states

• release energy and move to higher energy states

• release energy and move to lower energy states

Tags

NGSS.HS-PS4-3

The elements on the Periodic Table of the Elements are arranged in order of increasing

• atomic mass

• atomic number

• mass number

• oxidation state

Atoms of which element in Group 15 have the greatest electronegativity?

• As

• Bi

• N

• P

Tags

NGSS.HS-PS1-1

Which term represents the simplest whole number ratio of atoms of the elements in a compound?

• atomic mass

• formula mass

• empirical formula

• structural formula

How many electrons are shared in a triple bond between two atoms?

• 6

• 2

• 3

• 4

Given the equation representing a reaction:

Cl₂ → Cl + Cl

What occurs during this reaction?

• Energy is released as a bond is broken

• Energy is released as a bond is formed.

• Energy is absorbed as a bond is broken.

• Energy is absorbed as a bond is formed.

Tags

NGSS.HS-PS1-4

Krypton atoms in the ground state tend not to bond with other atoms because their

• second electron shell contains eight electrons

• third electron shell contains eighteen electrons

• innermost electron shell contains two electrons

• outermost electron shell contains eight electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

All matter can be classified as

• an element

• a compound

• a mixture or an element

• a mixture or a substance