(i)write the formula of the sulphate of the element with atomic number 13
(ii)what type of bonding will be present in the oxide of the element with atomic number one
(iii)which feature of the atomic structure occocents for the similarities in chemical properties of the element with atomic number one
(iv)write the electronic configuration of the elements in the third period that gains one electronto change into an anion

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Solution

Atomic number = 13. Aluminium has configuration 2, 8, 3. Hence the valency of aluminium is +3 and that of the sulphate ion is 2-.Thus the formula of the sulphate is Al₂(SO₄)₃

Element with atomic number one is hydrogen. Its oxide is H₂O. Bonding between oxygen-hydrogen bond is covalent bonding.

The last electron goes to outermost s-orbital, in all elements of group one. Showing similar properties with element with atomic number one.

Chlorine belongs to third period. Upon gaining an electron it becomes an anion. Cl + e^- $\to$ Cl^-

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Similar questions

Q. The following table represents the first three periods of the modern periodic table. Study the table and answer the questions that follow:
(i) Write the formula of the sulphate of the element with atomic number 13.
(ii) What type of bonding will be present in the oxide of the element with atomic number 1?
(iii) Which feature of the atomic structure accounts for the similarities in the chemical properties of the elements in group VIIA of the periodic table?
(iv) Name the element which has the highest ionization potential.
(v) How many electrons are present in the valence shell of the element with atomic number 18?

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(vi) What is the name given to the energy released, when an atom in its isolated gaseous state accepts an electron to form an anion?
(vii) What is the electronic configuration of the element in the third period which gains one electron to become an anion?
(viii) 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.

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