Answer:
1. Which statement about metals and nonmetals is correct?
Answer: Metals can be hammered into thin sheets, and nonmetals are brittle.
2. Based on properties of elements in the periodic table, which element is the best conductor of thermal energy?
Answer: vanadium (V)
3. Which element has four valence electrons?
Answer: silicon (Si)
4. Which statement best explains why hydrogen’s atomic number is equal to its mass?
Answer: Hydrogen does not have any neutrons.
5. Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)?
Answer: Francium has fewer valence electrons, but they are in a higher energy level.
6. Gallium has an atomic number of 31 and a mass number of 70. Which table shows the number of protons, neutrons, and electrons in a gallium ion with a +3 charge?
Answer:
Particle | Number
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protons | 31
neutrons | 39
electrons | 28
7. Which is true about stable isotopes?
Answer: A stable nucleus has a similar number of protons and neutrons.
8. On which atomic property proposed by Henry Moseley is the current periodic table of the elements based?
Answer: atomic number
9. Which incorrect aspect of Rutherford’s model was fixed by Bohr’s model?
Answer: Electrons move freely in curved paths around the nucleus.
10. You plan to pass alpha particles through a field that contains a consistent type of particle. Which configuration will result in the largest deflection of alpha particles?
Answer: low-energy alpha particles passing through a field of high mass-number-particles
11. Where on the periodic table do you find elements that have full valence electron shells?
Answer: on the right side of the periodic table
12. Which element would have a full outer shell of electrons if it gained three electrons?
Answer: nitrogen
13. Which group of elements has the most similar chemical properties?
Answer: fluorine, chlorine, and iodine
14. Why are the noble gases the least reactive elements?
Answer: They have a full valence electron shell.
15. Group 2 elements have two valence electrons. Which kind of bond will they most likely form, and why?
Answer: An ionic bond is likely because they will want to give away two valence electrons in order to become stable.
16. An element has six valence electrons. Which ionic charge will its ion carry?
Answer: 2–
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Step-by-step explanation:
Easy 100!