Electron and Periodic Table

In the modern periodic table elements are arranged by:

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

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An element's identity is determined by the number of

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

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

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Which is an electron?

• A
• B
• C

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What is the electron configuration of sodium?

• 2.8
• 2.8.2
• 2.8.1
• 11

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What is the electron configuration of Aluminium?

• 2.8.3
• 2.11
• 13
• 2.8.2

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Which is the electron configuration for an oxygen atom?

• 1s²2s²2p⁶3s²3p⁶4s²
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶

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What is this element? 
1s²2s²2p⁶3s²3p⁶
4s²3d¹⁰4p⁶

• Argon
• Krypton
• Selenium
• Bromide

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NGSS.HS-PS1-1

What is the shorthand electron configuration for Sulfur atom?

• [Ar] 3p⁴
• [He] 3s²3p⁴
• [Ne] 3s²3p⁴
• [Na] 3s²3p³
  

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NGSS.HS-PS1-1