Understanding Atoms and Bonding

The space around the nucleus of an atom is called what?

• atomic halo
• proton cloud
• nuclear field
• electron cloud

Each electron occupies its own area called what?

• cloud

• nucleus
• oscillation

• orbit

What are "Valence Electrons"?

• Valence electrons are the electrons in the innermost shell of an atom
• Valence electrons are the electrons in the middle shell of an atom
• Valence electrons are the electrons in the nucleus of an atom
• Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

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If there are 29 protons in a copper atom with an atomic mass of 63.54 grams how many electrons are there?

• 31
• 28
• 32

• 29

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When we list the elements that make up Earth why don't we list water?

• Water is a compound, not an element.
• Water is a man-made substance.

• Water is not found on Earth.
• Water can be a gas, a solid, or a liquid.

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What is an "isotope"?

• Different elements with the same number of neutrons.
• Atoms of the same element with different numbers of neutrons.
• Atoms of different elements with different numbers of protons.
• Atoms of the same element with different numbers of electrons.

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How can we mathematically solve to find the number of "protons" of an atom if we know the number of "neutrons"?

• Check the number of protons in a different atom
• Look up the atomic number of the element on the periodic table to find the number of protons.
• Subtract the number of neutrons by 2

• Count the number of electrons in the atom

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When the number of "protons" is equal to the number "electrons" in an atom that atom is said to be in what state?

• negative
• positive
• neutral
• charged

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What is an "ion"?

• An ion is a positively charged atom resulting from one less electron than protons.

• An ion is an atom or molecule that has either a net positive or negative electric charge.

• An ion is a negatively charged atom resulting from one more electron than neutron in the orbit.

• An ion is a type of fish found in the ocean.

What happens to atoms during a chemical change?

• Atoms are absorbed and disappear completely

• Atoms remain unchanged and just hang out together.

• Atoms combine to form a single substance
• Atoms rearrange to form new substances with different properties.

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