At room temperature, a certain element is found to be a soft, silver-colored solid that reacts violently with water and is a good conductor of electricity. Is the element likely to be a metal, a nonmetal, or a semimetal?

A small speck of carbon, the size of a pinhead, contains about 10$^{19}$atoms, the diameter of a carbon atom is 1.5 X 10 $^{-10}$ m, and the circumference of the Earth at the equator is 40,075 km. How many times around the Earth would the atoms from this speck of carbon extend if they were laid side by side?

Classify the following elements as metals, nonmetals, or semimetals:

(a) Ar

(b) Sb

(c) Mo

(d) Cl

(e) N

(f) Mg

Classify the following elements as metals, nonmetals, or semimetals:

(a) Ti

(b) Te

(c) Se

(d) Sc

(e) Si

What is a semimetal, and where in the periodic table are semimetals found?

Where in the periodic table are the metallic elements found? Where are the nonmetallic elements found?

Where in the periodic table are the main-group elements found? Where are the transition metal groups found?

What common characteristics do elements within a group of the periodic table have?

How many groups are there in the periodic table? How are they labeled?

In the periodic table, (a) what are the rows called and (b) what are the columns called?

What is wrong with each of the following statements?

(a) The symbol for carbon is ca.

(b) The symbol for sodium is So.

(c ) The symbol for nitrogen is Ni.

(d) The symbol for chlorine is Cr.

What is wrong with each of the following statements?

(a) The symbol for tin is Ti.

(b) The symbol for manganese is Mg.

( c) The symbol for potassium is Po.

(d) The symbol for helium is HE.

The gold foil that Rutherford used in his scattering experiment had a thickness of approximately 0.005 mm. If a single gold atom has a diameter of 2.9 X 10 $^{-10}$ m, how many atoms thick was Rutherford’s foil?

Give the names corresponding to the following symbols:

(a) B

(b) Rh

(c ) Cf

(d) Os

(e) Ga