Could someone help with my answers I chose for these questions to see if they are correct. Thank you!!! 1.Check all true statements about nonmetals.
Nonmetals have low melting and boiling points. Yes, this is true!✅
Nonmetals are brittle and have a relatively low density. Yes, this is true!✅
Nonmetals are good at thermal and electrical conduction.
All nonmetals are gaseous at room temperature. Some nonmetals are not gasses at room temperature many of them are solid, and bromine is a liquid at room temperature.❌

2.How many of each subatomic particle are in a neutral atom of Potassium-39? What is its mass number? Potassium is in group 1 and has the symbol "K".
protons 19✅
neutrons 20✅
electrons 19✅
mass number 39✅

3. Match the ion with its charge.
11 protons, 12 neutrons, 10 electrons = +1✅
Groups 17, period 2 = -1✅
31 protons, 39 neutrons, 28 electrons = +3✅
Group 2, period 5 = +2✅

4. Which best describes a metal such as Silver (Ag)?
Low melting point, forms anions, good insulator.
Dull, highly reactive, and a semiconductor.
Brittle, a good conductor, and ductile. ❌
Lustrous, malleable, and forms cations.

5. Determine if the "quoted" word(s) makes each statement True or False.

Elements that share the most characteristics are found on the periodic table in the same "horizontal period". False✅

If matter has a higher temperature, that means there will be "more" molecular motion. True✅

If you put a balloon in a freezer, its volume would "increase". False✅

If you put the balloon into a chamber where there is half the pressure, its volume will "double". True✅

If you cool down a propane tank, there will be "less" pressure in it. True✅

The average atomic mass of Aluminum (Al) is "16.00 amu". False✅

Oxygen's atomic number is "8" therefore it has "8" protons in its nucleus. True✅

An "electron" has the same mass as a neutron. False✅

The nucleus contains "protons and neutrons", virtually all the mass of an atom. True✅

6. Use your periodic table and the given atomic numbers to locate the elements. Then, use their group number to determine how many valence electrons each has.
Krypton (Kr) atomic #36 =8✅
Fluorine (F) atomic #9 = 7✅
Francium (F) atomic #87 = 1✅
Tin (Sn) atomic #50 = 4✅
(the group number tells you the number of valence electrons with the maximum being 8 valence electrons in group 18)