Atomic Structure and Periodic Table

Which statement is accurate regarding subatomic particles?

• electrons are the heaviest particle, with a positive charge

• protons and electrons are equal in mass with positive charges

• electrons are neutral with the least mass

• protons have a positive charge with a mass of 1 amu and neutrons are neutral with the same mass as a proton

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Which of the following is a conclusion of Rutherford's gold foil experiment?

• The nucleus is negatively charged

• The atom is dense solid and is indivisible

• The mass is conserved when atoms react chemically

• The nucleus is very small and the atom is mostly empty space

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Dalton theorized that atoms were indivisible. Thomson's findings contradicted this because

• Thompson theorized that atoms of the same element are identical

• Thomson claimed that atoms of different elements could combine chemically to form new compounds

• Thomson discovered the electron, proving that subatomic particles exist

• Thompson found that atoms of one element cannot become another element

Which atom has a nucleus that contains 13 protons and 14 neutrons?

• Mg

• Be

• Al

• N

In the modern periodic table elements are arranged in order of increasing

• mass number

• atomic number

• oxidation number

• valence electron number

Beryllium is classified as

• an alkali metal

• an alkaline earth metal

• a halogen

• a noble gas

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The most reactive metals are the

• alkali metals

• alkali earth metals

• transition metals

• metalloids

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Which of the following is NOT true regarding families (groups) on the periodic table?

• they have similar characteristics

• they have the same number of valence electrons

• the atomic radius increases as you go down

• groups are identical to periods on the periodic table

On the periodic table, Periods are

• Horizontal rows

• Vertical columns

Name this element.

• Argon

• Chlorine

• Aluminum

• Boron

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