3/19: TEKS 8.5A & B Review DOL

The atomic mass of krypton is 84. Which answer shows the sub-atomic particles inside and outside of the nucleus?

• # of particles inside: 36

  # of particles outside: 36

• # of particles inside: 36

  # of particles outside: 48

• # of particles inside: 84

  # of particles outside: 36

• # of particles inside: 84

  # of particles outside: 48

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

The atomic number of 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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Which table correctly identifies the charges of subatomic particles?

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How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?

• 72 protons, 178 neutrons, 106 electrons

• 72 protons, 106 neutrons, 72 electrons

• 178 protons, 250 neutrons, 72 electrons

• 106 protons, 72 neutrons, 106 electrons