Question

1. what do elements of the same group in the periodic table have in common?
2. within the same period of the periodic table, how do the properties of elements close to each other compare with the properties of elements far from each other?
3. you are trying to manufacture a new material, but you would like to replace one of the elements in your new substance with another element that has similar chemical properties. how would you use the periodic table to choose a likely substitute?
4. what is the difference between a family of elements and elements in the same period?
5. complete the table below by filling in the spaces with correct names or symbols.

	name of element	chemical symbol
2		ca
3		mn
4	nickel
5	potassium
6	cobalt
7		ag
8		h

Explanation:

1. Elements in the same group have the same number of valence electrons, which leads to similar chemical properties.
2. In the same period, elements close to each other have more similar properties than those far apart as properties change gradually across a period due to changes in atomic structure.
3. You would look for an element in the same group as elements in the same group have similar chemical properties.
4. A family of elements (group) has elements with similar chemical properties due to the same number of valence - electrons. Elements in the same period have the same number of electron shells but different numbers of valence electrons and show a trend in properties across the period.

34.

1. The chemical symbol of aluminum is Al.
2. The name of the element with symbol Ca is calcium.
3. The name of the element with symbol Mn is manganese.
4. The chemical symbol of nickel is Ni.
5. The chemical symbol of potassium is K.
6. The chemical symbol of cobalt is Co.
7. The name of the element with symbol Ag is silver.
8. The name of the element with symbol H is hydrogen.

Answer:

1. They have the same number of valence electrons and similar chemical properties.
2. Elements close to each other have more similar properties than those far apart.
3. Look for an element in the same group.
4. A family (group) has similar chemical properties due to same valence - electron number; elements in a period have same electron - shell number but show property trends.

34.

1. Al
2. Calcium
3. Manganese
4. Ni
5. K
6. Co
7. Silver
8. Hydrogen