Chemical Formulas Ionic and Polyatomic Formula Balancing Equation Polar and Non Polar

Which compound has covalent bonds?

• H₂O

• Na₂O

• Li₂O

• K₂O

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In the ground state, an atom of which element has seven valence electrons?

• fluorine

• sodium

• nitrogen

• oxygen

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The degree of polarity of a covalent bond between two atoms is determined by calculating the difference in their

• atomic radii

• electronegativities

• melting points

• ionization energies

When an F atom becomes an F^- ion, the F atom

• gains a proton

• gains an electron

• loses a proton

• loses an electron

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NGSS.HS-PS1-2

Which ion in the ground state has the same electron confi guration as an atom of neon in the ground state?

• Ca²⁺

• Li⁺

• Cl^-

• O^2-

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NGSS.HS-PS1-1

Which element is classified as a metalloid?

• Te

• Hg

• S

• I

The least polar bond is found in a molecule of

• HI

• HCl

• HF

• HBr

When a Mg²⁺ ion becomes a Mg atom, the radius increases because the Mg²⁺ ion

• gains 2 protons

• loses 2 protons

• gains 2 electrons

• loses 2 electrons

Elements that have atoms with stable valence electron configurations in the ground state are found in

• Group 1

• Group 2

• Group 8

• Group 18

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