Periodic Table

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Tags

NGSS.HS-PS1-1

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An element's identity is determined by the number of

• electrons.
• protons.
• neutrons.
• valence.

All matter is made of .....

• energy 
• atoms 
• air
• chemistry

Tags

NGSS.MS-PS1-1

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The atomic number of an element tells the number of _____ in the nucleus of an atom of that element.

• protons
• neutrons
• electrons
• isotopes

Most of the mass of an atom is found it its _____.

• electron cloud
• nucleus
• atomic number
• empty space

Tags

NGSS.HS-PS1-8

Each is an example of matter except _____.

• a cloud
• air
• a dust particle
• a beam of light

An element is made up of only one kind of _____.

• isotope
• plastic
• atom
• metal

Rutherford's experiment showed that most of an atom is made up of _____.

• a nucleus
• an electron cloud
• empty space
• alpha particles

An element is made up of only one kind of _____.

• isotope
• plastic
• atom
• metal

What subatomic particles are located in the electron cloud?

• quarks
• protons
• electrons
• neutrons

Tags

NGSS.MS-PS1-1