Atoms and Elements

Which of the following best describes an atom?

• protons and neutrons grouped together
• protons and electrons grouped together
• a core (center) of protons and neutrons surrounded by electrons
• a core of electrons and neutrons surrounded by protons

Tags

NGSS.MS-PS1-1

Which of the following is found farthest from the center of an atom?

• nucleus
• proton
• neutron
• electron

What makes an atom have a positive charge?

• more electrons than protons
• more neutrons than electrons
• more protons than electrons
• less protons than electrons

The protons in an atom’s nucleus have what kind of charge?

• positive
• negative
• neutral
• no charge

What is the basic unit of matter (smallest part of an element)?

• atoms
• elements
• protons
• compounds

Tags

NGSS.5-PS1-1

All atoms of an element have the same number of _____________.

• neutrons
• electrons
• protons
• atomic mass

Tags

NGSS.MS-PS1-1

A substance that cannot be separated or broken down into simpler substances by chemical means is?

• Mixture

• Element

• Compound

• Molecule

What is the name of this element?

• K
• Potassium
• 39.098
• 19

Tags

NGSS.MS-PS1-1

What is the atomic number of this element? 

• 19
• Potassium
• 39.098
• K

Tags

NGSS.MS-PS1-1

What is the chemical symbol of this element? 

• Potassium
• K
• 39.098
• 19