Chemical Bonding

What is the charge on an atom's nucleus?

• Negative charge
• Neutral charge
• Variable charge
• Positive charge

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NGSS.MS-PS1-1

The letter O is used to represent oxygen. What is the letter O called?

• Element name
• Atomic number
• Molecular formula
• Chemical symbol

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NGSS.MS-PS1-1

What are the negative particles in an atom called?

• Nuclei
• Protons
• Neutrons
• Electrons

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What is a charged particle is known as?

• ion
• electron
• proton
• neutron

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NGSS.MS-PS2-3

How does the formation of a covalent bond make two atoms more stable?

• Covalent bonds increase the distance between atoms, making them more stable.
• Atoms become stable by losing electrons during covalent bond formation.
• The formation of a covalent bond makes two atoms more stable by allowing them to share electrons and achieve full outer electron shells.
• Covalent bonds create a magnetic field that stabilizes the atoms.

What type of bond does a polar molecule have?

• covalent bond with unequally shared electrons

• metallic bond with unequally shared electrons

• ionic bond with unequally shared electrons

• james bond with unequally shared electrons

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NGSS.MS-PS1-1

Which term means without water?

• hydrate

• anhydrous

• aqueous

• hydrogen

How many electrons are needed in the outer energy level of most atoms for the atom to be chemically stable?

• 10
• 6
• 4
• 8

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NGSS.MS-PS1-1

What shows the elements that make up a compound and the exact number of atoms of each element in a unit of the compound?

• Molecular weight
• Chemical formula

• Elemental analysis
• Chemical reactiion

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NGSS.MS-PS1-1

Silicon dioxide is written SiO2. What does the number 2 represent?

• The number 2 represents the total number of atoms in the compound.
• The number 2 represents the quantity of oxygen atoms in the compound.
• The number 2 indicates the charge of the silicon atom.
• The number 2 signifies the molecular weight of the compound.

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NGSS.MS-PS1-1