Which of these statements about a negative ion is true?

Remember: electrons are negative, protons are positive, neutrons are neutral

• It has an equal number of protons and electrons

• It has more protons than electrons

• It has more electrons than protons

What happens when sodium and chlorine atoms form sodium chloride?

Remember: sodium is a metal and chlorine is a non-metal

• An electron transfers from each sodium atom to each chlorine atom

• An electron transfers from each chlorine atom to each sodium atom

• Sodium and chlorine atoms share electrons

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a covalent bond?

• A bond formed between oppositely charged ions

• A bond formed when two atoms share a pair of electrons

• A bond formed by delocalised electrons

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NGSS.MS-PS1-1

In a dot and cross diagram, what does each dot and cross represent?

• A neutron

• A proton

• An electron

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NGSS.MS-PS1-1

What is the greatest number of covalent bonds that one carbon atom can form?

Hint - how many outer electrons does carbon have?

• 2

• 3

• 4

What combination of elements will form covalent bonds?

• Metal atom and another metal atom

• Metal atom and non-metal atom

• Non-metal atom and another non-metal atom

Tags

NGSS.MS-PS1-1

Which of the following pairs of elements would join together with ionic bonding?

• Iron and sulfur

• Iron and chromium

• Hydrogen and sulfur

Which type of bonding results from the electrostatic force of attraction between positively and negatively charged ions?

• Metallic bonding

• Ionic bonding

• Covalent bonding

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NGSS.HS-PS2-4

How is the covalent bond held together?

• Electrostatic attraction between each nuclei and the shared electrons between them

• Electrostatic attraction between positive and negative ions

• Static attraction between nuclei and protons

Tags

NGSS.MS-PS1-1

What does a metallic bond consist of?

• Forces between metal ions and delocalised electrons

• Pairs of metal atoms joined together by strong bonds

• Forces between oppositely charged metal ions

Tags

NGSS.MS-PS1-1