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 which is a crucial constituent of all organic compounds belongs to:

Which among the following elements has the largest atomic radii?

The electronic confgurations of three elements X, Y and Z are: X : 2 Y : 2, 8, 7 Z : 2, 8, 2 Which of the following is true regarding these elements?

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.

Three elements B, Si and Ge are:

What type of oxide would Eka-aluminium form?

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

Arrange these elements in increasing order of their atomic radii

Why does atomic radius decreases as we move from left to right in a period

Which among the following has larger size of atoms?

The metallic character vary across the period

The number of groups in the Modern Periodic Table

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

Three elements B, Si and Ge are: Metalloids (d)