Chemistry

Periodic law states that the elements are arranged according to their atomic ________ so that elements with similar chemical properties are in the same ________ and properties repeat periodically.

• numbers, rows

• masses, column

• masses, rows

• numbers, column

Tags

NGSS.HS-PS1-1

Match the following charges of elements.

• 3+

• group 2

• 1+

• group 17

• 2+

• group 16

• 2-

• group 13

• 1-

• group 1

Nonmetals __________ electrons and are called_________

• lose electrons, cations

• gain electron, cations

• lose electrons, anions

• gain electron, anions

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

___________ is the only metal that is a liquid at room temperature.

• Gold (Au)

• Bromine (Br)

• sodium (Na)

• mercury (Hg)

In order for metals to become stable, it needs to _________ and the ions name will be __________.

• lose, cations

• gain, cations

• lose, anions

• gain, anions

Which element is found in group 2, period 6?

• Oxygen (O)

• Selenium (Se)

• Barium (Ba)

• Carbon (C)

Which element has similar chemical properties as sodium but has 7 energy levels?

• Francium (Fr)

• Rubidium (Rb)

• Cesium (Cs)

• Potassium (K)

How many electrons in a neutral lithium atom?

• 3

• 7

• 4

• 1

Tags

NGSS.MS-PS1-1

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons