Science : Ch 05 – Periodic of Classification of Elements

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

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

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?

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

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:

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 one of the following does not increase while moving down in group of the  periodic table?

Modern Periodic Law States that

The number of Periods in the Modern Periodic Table are

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

Is calcium?