Atoms and Elements

What does the atomic number represent?

• the number of protons and usually electrons too

• the number of protons and neutrons

• the number of neutrons

What is the atomic mass for the element in this image?

• 14

• 7

• 15

• 18

Tags

NGSS.MS-PS1-1

What are the three particles that make up the atom?

• clouds, positives, negatives

• clouds, energy levels, particles

• protons, neutrons, electrons

• molecules, electrons, protons

How many elements are there in the periodic table?

• 118

• 100

• 226

• too many to count

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 

The subatomic particle with a negative charge is the

• electron

• proton

• neutron

• nucleus 

Where are electrons of an atom found?

• Nucleus

• Electron Cloud

• Some are in the nucleus and some in the electron cloud.

• They are moving everywhere.

The mass of an atom come from the...

• electrons

• nucleus

• protons

• empty space

Elements in the same group or column have the same ...

• # of valence electrons

• # of shells

• # of protons

• Mass Number