Science : Ch 05 – Periodic of Classification of Elements

Which of the following affirmation about the modern periodic table are inappropriate?

1. The elements in the modern periodic table are arranged on the basis of their decreasing atomic numbers
2. The elements in the modern periodic table are arranged on the basis of their increasing atomic masses.
3. Isotopes are placed in adjoining group(s) in the periodic table.
4. The elements in the modern periodic table are arranged on the basis of their increasing atomic number

An element X is forming acidic oxide. Its most expected position in the modern periodic table is:

On the basis of electronic confguration of X9 5 , the group number and period of the element ‘X‘ is:

In Mendeleev’s periodic table, gaps were left for the elements to be discovered later. Which of the subsequent element found a place in the periodic table later?

Where would you establish the element with electronic confguration 2, ǫ in the modern periodic table?

As claimed by Mendeleev’s periodic law, the elements were arranged in the periodic table in the order of:

Which of the following are the characteristics of isotopes of an element?

1. Isotopes of an element have the same atomic masses.
2. Isotopes of an element have the same atomic number
3. Isotopes of an element show the same physical properties.
4. Isotopes of an element show the same chemical properties.

Which of the subsequent set of elements is written in sequence of their increasing metallic character?

Which is not true about the noble gases?

The valency of an element vary across a period

The metallic character vary across the period

How many metals are present in second period of periodic table?

The number of groups in the Modern Periodic Table

Arrange the following elements in increasing order of their atomic radii:

Arrange the following elements in the order of their increasing non-metallic character Li, O, C, Be and F