Atoms and Bonding

A positively charged particles is

• an electron

• a neutron

• a proton

• an isotope

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Because an atom is neutral, the number of

• electrons equals the number of protons
• protons equals the number of neutrons
• isotopes equals the number of electrons
• electrons equals the number of neutrons 

In the periodic table, elements are arranged in order of 

• decreasing atomic number
• increasing atomic number
• increasing number of energy levels
• decreasing number of isotopes 

All of the following are true of an ionic bond except,

• forms when one atom transfers electrons to another

• is held together due to opposite charges

• occurs when atoms share electrons

• is the type of bond that hold NaCl together

How many  protons would an element with the atomic number of 18 have in its nucleus? 

• 11
• 9
• 18

Atoms tend to be stable and nonreactive if they have SIX valence electrons. 

• True
• False

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NGSS.HS-PS1-1

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What is the number of electrons needed in an atom's shell to make it stable or 'happy'?

• 2 or 8
• 3 or 5
• 1 or 9
• 4 or 6

Why do ionic bonds form?

• so the number of protons equals the number of electrons
• to fill the outermost energy level
• so an atom can become unstable

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Atoms that gain electrons become...

• negatively charged
• positively charged
• remain neutrally charged
• 21

if METALS are more likely to LOSE electrons, they will form ...

• anions
• neutral atoms
• positive ions
• negative ions

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