How does non-metallic character vary from left to right in a period?

How does electropositive character of elements in a period vary from left to right?

How does metallic character vary down a group?

How does the elements having similar properties are placed in the same group or period?

Which has smaller size; Na or Na⁺?

Which has bigger size; Cl or Cl^-?

An element ‘X’ belongs to the second group of periodic table. What is the formula of its chloride?

An element ‘B’ belongs to the second period and Group 13. Give the formula of its oxide.

Give two examples of elements of Groups 1, 2, 16 and 17.

What is the number of valence electrons in the last element of the 3^rd size?

Which one has the bigger size?

Na (11) or Cl (17); Cl (17) or F (9)

Which one has the smaller size?

K (19) or Na (1); B (5) or C (6)

Calcium is an element with atomic number 20.

(i) Is it a metal or non-metal?

(ii) Is it more reactive than Mg or less?

(iii) What will be its valency?

(iv) What will be the formula of its Chloride?

(v) Will it be larger than K or smaller?

For the main groups of periodic table given as follows:

(a) Which element is the most metallic?

(b) Which atom is the largest?

(a) Which is the most reactive metal?

(b) Which is the most reactive non-metal?

This question refers to the elements of the periodic table with atomic numbers 3 to 18.

(a) (i) Which of them are noble gases?

(ii) Which of them are halogens?

(iii) Which of them are akali metals?

(iv) Which are the elements with valency 4?

(b) An element with atomic no. 3 combines with another element with atomic number 17; what would be the formula of the compound?

(c) What is the electronic configuration of an element with atomic number 10?

Give the symbols for:

(i) a metal of group 2

(ii) a metal of group 13

(iii) two non-metals of group 16

(iv) most reactive non-metal group 17.

Why is K more reactive than Li?

Why He, Ne and Ar called inert gas?

Which one has larger atomic size– Cl or Br? Why?

Where in period 3 of the modern periodic table do we find:

(a) non-metals?

(b) elements forming negative ions?

(c) elements with high melting points?

(d) elements forming positive ions?

(e) metals?

(f) elements with low boiling points?

Mention their atomic numbers only.

An element belongs to 4^th period and group 17 of the periodic table. Find out:

(a) the number of valence electrons.

(b) is it a metal or non-metal.

(c) the name of the element.

(d) formula of its compound with hydrogen.

(e) electron dot structure of this element with calcium.

The position of certain elements in the Periodic Table are shown below.

Using the above table answer the following questions:

(a) Which element will form only covalent compounds?

(b) Which element is a non-metal with valency 2?

(c) Which element is a metal with valency 2?

(d) Out of H, C, F, which has largest atomic size?

(e) Give name of family to which H, C and F belong?

An element has electronic configuration 2, 8, 7.

(a) To which group and period of the long form of Periodic Table does it belong?

(b) What is atomic number of this element?

(c) Is it metallic or non-metallic and why?

(d) Identify the element.

(e) Name an element chemically similar to this element.

The positions of three elements A, B and C in the periodic table are indicated below:

(a) State whether element C would be a metal or a non-metal. Why?

(b) Which is the more active element, A or C? Why?

(c) Which type of ion (cation or anion) will be formed by the element C? Why?

Atoms of seven elements A, B, C, D, E, F and g have a different number of electronic shells but have the same number of electrons in their outermost shells. The elements A and C combine with chlorine to form and acid and common salt respectively. The oxide of element A is liquid at room temperature and is a neutral substance, while the oxide of the remaining six elements are basic in nature. Based on the above information, answer the following question:

(i) What could the element A be?

(ii) Will element A to G belong to the same period or same group of the periodic table?

(iii) Write the formula of the compound formed by the reaction of the element A with oxygen.

(iv) Show the formation of the compound by a combination of element C with chlorine with the help of electronic structure.

(v) What would be the ratio of number of combining atoms in a compound formed by the combination of element A with carbon?

(vi) Which one of the given elements is likely to have the smallest atomic radius?

In the following table, six elements A, B, C, D, E and F (here letters are not the usual symbols of the elements) of the modern Periodic Table with atomic numbers 3 to 18 are given:

(a) Which of these is (i) a noble gas, (ii) a halogen?

(b) If B combines with F, what would be the formula of the compound formed?

(c) Write the electronic configurations of C and E.

In the following table, are given eight elements A, B, C, D, E, F, G and H (here letters are not the usual symbols of the elements) of the Modern Periodic Table with the atomic numbers of the elements in parenthesis.

(i) What is the electronic configuration of F?

(ii) What is the number of valence electrons in the atom of F?

(iii) What is the number of shells in the atom of F?

(iv) Write the size of the atoms of E, F, G and H in decreasing order.

(v) State whether F is a metal or a non-metal.

(vi) Out of the three elements B, E and F, which one has the biggest atomic size?

(a) How does the atomic radius changes as you go

(i) from left to right in a period?

(ii) down a group in the periodic table?

(b) Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the Modern Periodic Table do these two elements belong? What type of bond will be formed between them and why?

“The atomic number of Lithium is 3.” On the basis of this information answer the question that follows:

(a) Write the electronic configuration of Li

(b) To which group Li belong?

(c) Find valency of Li.

(d) Identify type of ion it will form.

(e) Write down the formula of the compound formed by it.