Atoms, Elements, and Compounds Review

Which has the building blocks in the correct order, largest to smallest?

• Electron, element, atom, nucleus, proton, neutron, 
• Element, atom, nucleus, electron, proton, neutron, electron
• Atom, electron, nucleus, element, proton
• Element, atom, nucleus, neutron, proton, electron

If you see the symbols of two elements written side by side then it is an example of a ________________________ .

• compound
• electron
• neutron
• molecule

Tags

NGSS.MS-PS1-1

Water consists of molecules that each have two atoms of hydrogen and one atom of oxygen.  Water is considered a/an ____________________ .

• element
• atom
• compound

Tags

NGSS.MS-PS1-1

Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?

• Hydrogen is an element made of two or more kinds of atoms.
• Hydrogen is a compound made of only one kind of atom.
• Hydrogen is a compound made of two or more kinds of atoms.
• Hydrogen is an element made of only one kind of atom.

The element oxygen, represented by the symbol O, is classified as

• a pure substance
• a compound
• a mixture
• a solution

Tags

NGSS.MS-PS1-1

What is a compound?

• an atom with more electrons than protons
• a substance in which the atoms of two or more elements are combined together
• an atom with more neutrons than protons
• a substance in which the atoms of three or more elements are combined together

Tags

NGSS.MS-PS1-1

Atoms combine to form _______. 

• electrons
• molecules
• nuclei
• neutrons

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NGSS.MS-PS1-1

Most of the atom is filled with

• electrons
• empty space
• the nucleus
• protons

Element is a

• pure substance
• compound
• mixture
• molecule

Which of the following represents an element?

• H₂O
• H₂
• NaCl
• CaCO₃

Tags

NGSS.MS-PS1-1