Science : Ch 05 – Periodic of Classification of Elements

Which of the following declaration about the modern periodic table is accurate?

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?

Which of the following gives the accurate increasing order of the atomic radii of O, F and N?

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.

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following classification does the element belong?

Arrange these elements in decreasing order of their atomic radii

Arrange these elements in increasing order of their atomic radii

The metallic character vary across the period

The number of Periods in the Modern Periodic Table are

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

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

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