Periodic Table NCFE Review

An element located at Group 18 and Period 4 would be classified as which type of substance?

• a halogen

• a metalloid

• a lanthanoid

• a nonmetal

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This electron dot diagram represents which element?

• boron (B)

• phosphorus (P)

• sulfur (S)

• bromine (Br)

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This diagram represents a neutral atom of boron-11. How many protons and neutrons does boron-11 have?

• 11 protons, 11 neutrons

• 11 protons, 0 neutrons

• 6 protons, 5 neutrons

• 5 protons, 6 neutrons

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Which two elements have the same number of valence electrons?

• C and O

• Na and Mg

• Cl and F

• Ga and Ge

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Which of these elements is the most chemically reactive?

• zinc (Zn)

• Iron (Fe)

• potassium (K)

• germanium (Ge)

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Which element is classified as a metal?

• boron (B)

• antimony (Sb)

• Phosphorus (P)

• cadmium (Cd)

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The diagram below is the Bohr model of an atom. Which best describes this atom?

• it has 6 electrons

• it has a positive charge

• it has 6 valence electrons

• it has a full outermost energy level

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How many valence electrons are in a neutral atom of nitrogen (N)?

• 2

• 3

• 5

• 15

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Electrons are being shared between atoms in a certain compound. Which elements could most likely form this compound?

• lithium (Li) and fluorine (F)

• aluminum (Al) and iodine (I)

• sulfur (S) and oxygen (O)

• iron (Fe) and chlorine (Cl)

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Which of these elements is the most chemically reactive?

• beryllium (Be)

• calcium (Ca)

• strontium (Sr)

• radium (Ra)

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