Question

Give the names for each of the elements between atomic numbers 1 and 86 that has a symbol starting with "C".

Identify the family each element belongs to. If the element does not belong to a family, identify it as a metal or non-metal.

2. In your own words, define the following terms. a. Element b. Atom c. Molecule d. Compound 3. How many oxygen atoms are in one molecule (or formula unit) of each of the following compounds? NO3 Al(OH)3 Ca(NO3)2 Ba(OCN)2

Answer 1

Explanation:

1)

1. Carbon with atomic number 6. The symbol of carbon is C.It belongs to non metals.
2. Chlorine with atomic number of 17. The symbol of chlorine is Cl.It belongs to non metals.
3. Calcium with atomic number 20. The symbol of calcium is Ca. It belongs to metals.
4. Chromium with atomic number 24. The symbol of chromium is Cr. It belongs to metals.
5. Cobalt with atomic number of 27. The symbol of cobalt is Co. It belongs to metals.
6. Copper with atomic number of 29. The symbol of copper is Cu. It belongs to metals.
7. Cadmium with atomic number of 48. The symbol of cadmium is Cd. It belongs to metals.
8. Cesium with atomic umber of 55.The symbol of cesium is Cs. It belongs to metals.
9. Cerium with atomic number of 58. the symbol for cerium in Ce. It belongs to metals.

2)

Element are those substance which can not be split into simpler substance.they are made up of single atom.

Atom is the structural unit of the matter and smallest component of an element.

Molecules are group of atoms bonded together. The atom boned can be of more than one type.

Compounds are group of atoms of different elements bonded together.

3) Oxygen atoms in one molecule of following compounds:

a) $NO_3$

1 × 3 = 3

There 3 oxygen atoms in the 1 molecule of $NO_3$.

b) $Al(OH)_3$

3 × 1 = 3

There 3 oxygen atoms in the 1 molecule of $Al(OH)_3$.

c) $Ca(NO_3)_2$

2 × 3 = 6

There 6 oxygen atoms in the 1 molecule of $Ca(NO_3)_2$.

d) $Ba(OCN)_2$

2 × 1 = 2

There 6 oxygen atoms in the 1 molecule of $Ba(OCN)_2$.