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

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

Which of the subsequent is the outermost shell for elements of period 2?

Which of the following elements does not lose an electron with ease?

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.

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

Which of the subsequent elements will form an acidic oxide?

Arrange these elements in decreasing order of their atomic radii

Arrange these elements in increasing order of their atomic radii

Which of the following is the outermost shell for elements of period 2

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:

Is calcium?