use a periodic table to answer questions 15 - 17\n15. is antimony (sb) a metal, a nonmetal, or a metalloid…

use a periodic table to answer questions 15 - 17\n15. is antimony (sb) a metal, a nonmetal, or a metalloid? (1 point)\n16. in what phase would you find xenon (xe) at room temperature? (1 point)\n17. in what phase would you find aluminum (al) at room temperature? (1 point)\n18. using the periodic table below, shade in the nonmetals. (2 points)\nperiodic table of the elements\n19. unobtainium is a new element that was just discovered. it has a very high atomic mass and is very reactive. where on the periodic table would you assume that it would be located? explain why you feel it is there? (3 points)\n20. as you move down on the periodic table, describe what happens to the atomic mass. (1 point)\n21. as you move down the periodic table, describe what happens to the reactivity of nonmetals. (1 point)

use a periodic table to answer questions 15 - 17\n15. is antimony (sb) a metal, a nonmetal, or a metalloid? (1 point)\n16. in what phase would you find xenon (xe) at room temperature? (1 point)\n17. in what phase would you find aluminum (al) at room temperature? (1 point)\n18. using the periodic table below, shade in the nonmetals. (2 points)\nperiodic table of the elements\n19. unobtainium is a new element that was just discovered. it has a very high atomic mass and is very reactive. where on the periodic table would you assume that it would be located? explain why you feel it is there? (3 points)\n20. as you move down on the periodic table, describe what happens to the atomic mass. (1 point)\n21. as you move down the periodic table, describe what happens to the reactivity of nonmetals. (1 point)

Answer

Explanation:

Step1: Locate Antimony (Sb)

Antimony is in group 15 and period 5. It lies along the staircase - like line on the periodic table, so it is a metalloid.

Step2: Determine Xenon's phase

Xenon is a noble gas. Noble gases are in the gaseous state at room temperature.

Step3: Determine Aluminum's phase

Aluminum is a metal. Metals are solid at room temperature.

Step4: Shade non - metals

Non - metals are located on the right side of the periodic table. They include hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur, selenium, the halogens (fluorine, chlorine, bromine, iodine, astatine), and the noble gases. Shade these elements on the provided periodic table.

Step5: Locate Unobtainium

Elements with high atomic mass and high reactivity are likely to be metals. Metals are on the left - hand side of the periodic table. High reactivity suggests it might be in group 1 (alkali metals) or group 2 (alkaline earth metals) as these are very reactive metals.

Step6: Atomic mass trend

As you move down the periodic table, the atomic mass generally increases. This is because as you go down a group, the number of protons, neutrons, and electrons increases.

Step7: Non - metal reactivity trend

As you move down the periodic table, the reactivity of non - metals generally decreases. This is because the outermost electrons are further from the nucleus and less strongly attracted, making it harder to gain electrons.

Answer:

  1. Metalloid
  2. Gas
  3. Solid
  4. Shade hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur, selenium, the halogens (fluorine, chlorine, bromine, iodine, astatine), and the noble gases on the periodic table.
  5. Likely on the left - hand side, possibly group 1 or 2, because high atomic mass and high reactivity suggest it is a metal and group 1 and 2 metals are very reactive.
  6. The atomic mass generally increases.
  7. The reactivity of non - metals generally decreases.