Question

The following table represents the first period of the modern periodic table. Study the table and answer the questions that follow:

1. Write the formula of the sulphate of the element with atomic number 13.
2. What type of bonding will be present in the oxide of the element with atomic number 1?
3. Which feature of the atomic structure accounts for the similarities in the chemical properties of the elements in group VIIA of the periodic table?
4. Name the element which has the highest ionization potential.
5. How many electrons are present in the valence shell of the element with atomic number 18?
6. What is the name given to the energy released, when an atom in its isolated gaseous state accepts an electron to form an anion?
7. What is the electronic configuration of the element in the third period which gains one electron to become an anion?
8. Fill in the blanks:
   The atomic size ______ as we move from left to right across the period, because the ______ increases, but the ______ remains the same.

Answer 1

1. Al₂(SO₄)₃.
2. Covalent.
3. The elements of group VIIA all have same number of electrons in their valence shell and same valency.
4. Helium (He)
5. 8 electrons are present in the valence shell of the element with atomic number 18.
6. Electron affinity.
7. Electronic configuration of element in the third period which gains one electron to become an anion is 2, 8, 8.
8. The atomic size decreases as we move from left to right across the period, because the nuclear charge increases, but the number of shells remains the same.