1. The mass of an atom is mainly due to:
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Chapter 3: Atomic Structure + Ch 4
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2. Which subatomic particle has a positive charge?
3. Who discovered the nucleus?
4. Fatima is learning about the shielding effect. She understands that inner electrons shield outer electrons from the full attraction of the nucleus. As we move down a group, the shielding effect:
5. Who discovered the neutron?
6. Lara is studying the reactivity of alkali metals with water. She knows that sodium reacts vigorously with water. What product is formed when sodium reacts with water?
7. Which element is a non-metal?
8. Ibrahim is learning about electron affinity. He knows that electron affinity is the energy change when an electron is added to a gaseous atom. Which group has the most negative electron affinities (most favorable)?
9. Which of the following is a metalloid?
10. Rachel is studying the reactivity of halogens. She knows that the halogens undergo displacement reactions. Chlorine can displace bromine from potassium bromide. Which halogen is the most reactive?