5. Decide whether the following elements a metal, nonmetal, or metalloid. Se b.

Question

5. Decide whether the following elements a metal, nonmetal, or metalloid.

Se     b. Cs     c. Fe       d. Cu       e. Br     f. Cl       g. Si

6. Identify group and period for each of the following by referring to the periodic table. Also,   

    label each as metal, nonmetal or metalloid.

    a. C          b. Po     c. Cr         d. Mg         e. B

7. Write the formula for the compound of each of the following pairs of ions.

    a. Fe3+ and CN-   b. K+ and SO42-   c. Li+ and N3-   d. Ca2+ and P3-    e. Cr+3 and O-2 f. Sr+2 and O-2

8. Name the following compounds:

Mg3N2         b. CrSO4     c. CaO       d. PbCrO4

9. Write down the chemical formula of the following compounds:

Iron (II) phosphate   b. Titanium (IV) oxide    c. Thallium (III) nitrate

10. Name the following compounds:

SF4         b. Cl2O7      c. N2O4     d. P4O6     e. PCl3  

PCl5       g. Cl2O6

Explanation / Answer

5.

6.

a. C belongs to group 14 period 2

b. Po belongs to group 16 period 6

c. Cr belongs to group 6 period 4

d. Mg belongs to group 2 period 3

e. B belongs to group 13 period 2

7.

a. Fe(CN)3

b. K2SO4

c. Li3N

d. Ca3P2

e. Cr2O3

f. SrO

8.

a. Magnesium nitride

b. Chromium sulphate

c. Calcium oxide

d. Lead chromate

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