Answers GA-GSE Physical Science ARadioactivity

Radioactivity — Unit test Answers

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This chart show the amount of radioactivity measured from three unknown isotopes.Which statement describes each of the isotopes?

Isotope A was measured at day 24, Isotope B was measured at day 6, and Isotope C was measured at day 10.

Isotope A was measured at day 18, Isotope B was measured at day 4, and Isotope C was measured at day 5.

Isotope A was measured at day 24, Isotope B was measured at day 8, and Isotope C was measured at day 20.

Isotope A was measured at day 30, Isotope B was measured at day 6, and Isotope C was measured at day 10.

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Which properties are characteristic of metalloids?

high electrical conductivity and a high melting point

low electrical conductivity and a low melting point

intermediate conductivity and a high melting point

intermediate conductivity and a low melting point

What are the two parts of an atom?

the nucleus and the proton cloud

the neutron and the electron cloud

the neutron and the proton cloud

the nucleus and the electron cloud

Which best describes a radioactive isotope?

An atom is unstable.

An atom is stable.

There is only one other isotope.

There are many isotopes.

What trend does the reactivity of most nonmetals show in a periodic table, excluding the noble gases?

random changes without any trends on the periodic table

changes according to trends on the periodic table

increases from left to right across the periodic table

decreases from left to right across the periodic table

Atom A and Atom B have the same number of protons, but they do not have the same number of neutrons.Which statement describes these atoms?

Atom A and Atom B are isotopes of the same element.

Atom A and Atom B are different elements.

Atom A and Atom B have different atomic numbers.

Atom A and Atom B have the same mass number.

Which statement describes a property of a proton?

is found outside the nucleus

has a positive charge

has less mass than an electron

is repelled by electrons

While looking at xenon (Xe) on the periodic table, a student needs to find an element with a smaller atomic mass in the same group. Where should the student look?

directly up

directly down

directly to the left

directly to the right

The elements in group 17 of the periodic table are all called halogens. All halogens have the same

atomic number.

atomic mass.

number of possible isotopes.

number of valence electrons.

Which lists only metalloids?

arsenic (As), sulfur (S), and polonium (Po)

antimony (Sb), tellurium (Te), and gallium (Ga)

boron (B), germanium (Ge), and tellurium (Te)

polonium (Po), aluminum (Al), and silicon (Si)

Which property do metalloids share with nonmetals?

Both are brittle.

Both are shiny.

Both have low melting points.

Both are very conductive.

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Radioactivity — Unit test Answers

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