Answer:
I'm assuming you're talking about something like a regular housekey, in which case there are numerous things you can describe!
<u>Its mass:</u> how much it weighs, times the gravity of the system.
<u>Its color:</u> is it silver-colored, or gold, etc.?
<u>Its volume:</u> you could probably calculate this, though it would be hard because it's not a traditional shape, I assume.
<u>Its density:</u> this is mass/volume. It means how many of the atoms are in a given space; how tightly packed the atoms are.
<u>Its tendency to rust / its specific combination of metals or alloys:</u> is it made of copper, tin, steel.. and these are all things that can rust to varying degrees.
Atomic number of Fluorine-19 is 9. So, it must have 9 protons. As the mass number is 19, the number of neutrons will be 10.
In Tungsten-184, the number of protons is 74 and the number of electrons should also be 74.
In cobalt-59, the mass number should be 27 protons +22 neutrons = 49.
The only nonmetal
that is liquid at room temperature is the element Br or Bromine. When we say at
room temperature, it means at zero degrees Celsius and at one atmospheric
pressure. The metal that is liquid at room temperature is the element Hg or
mercury.
Answer:
20 atoms
Explanation:
There are 4 in H2O2 because of 2 hydrogens and 2 oxygens.
Then, multiply by 5 because the coefficient is 5, therefore there are 5 H2O2 molecules.
5 x 4 = 20