Atomic Structure Quiz-DC 2nd Block21

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1. Which of the following is true about subatomic particles in an atom?

• An electron is negatively charged and is the heaviest subatomic particle.
• A proton is positively charged and is the lightest subatomic particle.
• A neutron has no charge and is the lightest subatomic particle.
• The mass of a neutron is closely equal to the mass of a proton.

2. The nucleus is composed of________. Click on any that apply.

• protons
• electrons
• neutrons
• photons
• atoms

3. What does the number 84 in the isotope K-84 represent?

• mass number
• number of protons
• number of electrons
• number of neutrons
• atomic number

4. Atoms or ions representing the same element must have the same number of______.

• protons
• electrons
• neutrons
• mass number

5. The sum of the protons and neutrons in an atom equals the atom's _____.

• atomic number
• mass number
• atomic mass
• nuclear number
• electron cloud number

6. How many protons, electrons, and neutrons does an atom with an atomic number of 50 and a mass number of 125 amu have? The atom is neutral.

• 50 protons, 50 electrons, 75 neutrons
• 75 electrons, 50 protons, 50 neutrons
• 120 neutrons, 50 protons, 75 electrons
• 70 neutrons, 75 protons, 50 electrons

7. Which of the following isotopic notations has the correct number of neutrons?

• F-19 has 9 neutrons
• Cu-65 has 94 neutrons
• Mg-24 has 24 neutrons
• U-238 has 146 neutrons

8. Click on any difference(s) between isotopes of the same element? All the isotopes are neutral.

• neutrons
• mass number
• protons
• electrons
• atomic mass