Chemistry regents Midterm review

In an atom, an orbital represents

• the most probably location of a proton

• the most probable location of an electron

• the least probably location of a neutron

• photons emitted as electrons move to lower energy levels

Which particle has a mass so small, it is considered to be 0 amu?

• proton

• hydrogen nucleus

• neutron

• electron

During a flame test, sodium chloride produces an intense yellow flame. This yellow color is produced when electrons in excited atoms

• are gained by the atoms

• are lost by the atoms

• move to higher energy states within the atoms

• move to lower energy states within the atoms

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NGSS.HS-PS1-2

What quantity is the same among atoms of the same element?

• mass number

• atomic number

• number of neutrons

• number of nucleons

An atom that has 8 protons and 10 neutrons is an isotope of the element

• nitrogen

• oxygen

• fluorine

• neon

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NGSS.HS-PS1-8

Which elements have the most similar chemical properties?

• Ge, As, and Sb

• Mn, Fe, and Co

• S, Se, and Te

• P, S, and Cl

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NGSS.HS-PS1-2

Which temperature is equal to 170 C?

• 103 K

• 443 K

• -103 K

• 498 K

What is the overall charge of an ion that has 9 protons, 11 neutrons, and 10 electrons?

• +1

• -1

• +2

• -2

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NGSS.MS-PS1-1

Which electron configuration represents the atoms of a bromine atom in the excited state?

• 2-8-18-7

• 2-8-18-8

• 2-8-17-8

• 2-8-18-7-1

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NGSS.HS-PS1-1

As the elements in Group 2 in the periodic table are considered in order of increasing atomic number, there is a general increase in

• stability

• atomic radius

• electronegativity

• first ionization energy

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NGSS.HS-PS1-1

NGSS.HS-PS1-2