Unit 2 Chemistry

How many elements are in NaCl?

• 2

• 3

• 1

• 4

Tags

NGSS.MS-PS1-1

What are atoms?

• more than one element combined

• the largest particle of matter that exists

• made up of only pure substances

• Smallest particles of matter that make up everything around us

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Subatomic particles with a positive charge

• neutrons
• atomic mass
• protons
• isotopes

Subatomic particles that are neutral in charge

• Neutrons
• Protons
• Nucleus 
• Electrons

The smallest particle of an element that shows all the properties of that element.

• Subatomic Particles
• Atom
• Quarks
• Gluons

Where electrons are likely to be found as they travel around the nucleus

• Nucleus
• Electron Cloud
• Within a Proton
• Within a Neutron

A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass

• Electron Shells
• Orbitals
• Electron Cloud
• Nucleus

Calculation used to find the number of neutrons in an atom

• Atomic Mass - Atomic Number
• Atomic Number - Atomic Mass
• Atomic Mass - Electrons
• none of these

The only element with no neutrons in its nucleus.

• Oxygen
• Helium 
• Hydrogen
• Lithium