IPC Unit 3 Test on Atomic Structure and Periodic Table

Who discovered that atoms contain negative particles with almost no mass?

• Dalton

• Bohr

• Rutherford

• Thomson

Which of these best describes the subatomic particle at the end of the arrow?

• It has mass but no charge

• It has no mass and no charge.

• It has mass and a positive charge.

• It has no mass and equal number of positive and negative charges.

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A researcher wants to experiment with an element that reacts like calcium (Ca), but has a greater atomic mass. Which element should the researcher select for the experiment?

• Nitrogen (N)

• Magnesium (Mg)

• Barium (Ba)

• Potassium (K)

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Which pair of elements have the same number of valence electrons?

• Boron (B) and Carbon (C)

• Bromine (Br) and Fluorine (F)

• Carbon (C) and Aluminum (Al)

• Aluminum (Al) and Silicon (Si)

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When identifying an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?

• The total number of neutrons in the unknown element.

• The total number of particles in the nucleus of the unknown element.

• The number of protons in the nucleus of the unknown element.

• The number of valence electrons in the unknown element.

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Which type of element do the following characteristics best describe?

- gains electrons easily

- is brittle

• - a poor conductor of heat and electricity

• metal

• nonmetal

• metalloid

• molecule

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A scientist performs tests on a sample of an element. The element is a gas that poorly conducts electricity and heat. The scientist also noted that the sample was nonreactive. Based on this information, the element is a member of which group on the periodic table?

• Group 1

• Group 2

• Group 8

• Group 18

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The table shows characteristics of elements. Which element has an incorrect number of valence electrons displayed in the table?

• Carbon (C)

• Sodium (Na)

• Magnesium (Mg)

• Argon (Ar)

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Which of the following elements has the highest number of valence electrons?

• Lithium (Li)

• Chlorine (Cl)

• Fluorine (F)

• Argon(Ar)

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Which element is considered a metal?

• Bromine (Br)

• Carbon (C)

• Silicon (Si)

• Potassium (K)

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