8.5 A STAAR Chemistry Review

How many neutrons are in the nucleus of a potassium atom with an atomic mass of 39?

The atomic number is krypton is 36. If the mass number of a krypton atom is 84, which table shows the number of subatomic particles inside and outside the nucleus of the krypton atom?

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NGSS.MS-PS1-1

Which statement accurately describes the atoms of a specific element?

• An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

• A scandium, Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.

• An aluminum, Al, atom contains 27 electrons and 27 protons inside the nucleus.

• A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.

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NGSS.MS-PS1-1

Atoms of which two elements have a combined total of 23 protons?

• Sodium, Na, and magnesium, Mg

• Boron, B, and carbon, C

• Copper, Cu, and zinc, Zn

• None of these

How many valence electrons are in an atom of each element in Group 15 in the periodic table?

What is found in the nucleus of atoms?

• Protons and electrons.

• Protons, neutrons, and electrons.

• Protons and neutrons.

• Neutrons and electrons.

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NGSS.MS-PS1-1

Which is an electron?

• A

• B

• C

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NGSS.MS-PS1-1

What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom.

• 48

• 112

• 160

• 208

Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge

• The electrons are outside the nucleus and have no charge.

• The electrons are inside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a positive charge.

Which statement accurately describes atoms of tin, Sn?

• Tin atoms have 50 protons

• Tin atoms have five valence electrons.

• Tin atoms have 119 neutrons

• Tin atoms have 68 electrons

• Tin atoms have 4 energy levels

Tags

NGSS.MS-PS1-1