3.1 - Introduction to Atoms

Dalton's model of the atom was ...

• a solid sphere
• a sphere with embedded electrons
• a small nucleus with circling electrons
• none of these

Protons have a ___ charge

• neutral
• negative
• positive
• square

Electrons have a ___ charge

• positive
• neutral
• negative
• strange

Neutrons are ____

• neutral
• positive
• negative
• oval

AMU stands for 

• atoms must unify
• atomic mass utility
• atomic mass unit
• a mini unicorn

Tags

NGSS.HS-PS1-7

The particle with the LEAST mass is the 

• proton
• electron
• neutron
• nucleus

The mass number is the sum of these two particles

• protons and electrons

• neutrons and electrons

• electrons and nucleus

• protons and neutrons

Protons and neutrons each have an AMU of 

• 1.0
• 2.0
• 0.5
• 1/1840

Bohr's atomic model is said to resemble planets orbiting the sun or 

• seeds in a watermelon
• rings in a tree
• the pit of a cherry
• curls of smoke

The nucleus of an atom contains

• protons and electrons
• electrons and neutrons
• protons only
• neutrons and protons