Science : Ch 05 – Periodic of Classification of Elements

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

Which of the specified elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively affiliated to the same period?

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

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 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.

Three elements B, Si and Ge are:

Arrange these elements in increasing order of their atomic radii

Which is not true about the noble gases?

Which among the following has larger size of atoms?

The valency of an element vary across a period

The metallic character vary across the period

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

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