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Newlands could classify elements only upto

• Copper.

• Chlorine.

• Calcium.

• Chromium.

The most significant contribution towards the development of periodic table was made by

• Mendeleev.

• Avogadro.

• Dalton.

• Cavendish.

Law of Triads was referred to as ___ relationship.

• Lothar Meyer's

• Mendeleev's

• Newlands's

• Dobereiner's

Mendeleev classified elements in

• increasing order of atomic groups.

• eight periods and eight groups.

• six periods and eight groups.

• eight periods and seven groups

Noble gases were included in Mendeleev's periodic table in the

• 1st Group.

• 7th Group.

• 8th Group.

• None of these

Mendeleev's predictions for the elements Eka-aluminium and Eka-silicon were discovered later as ___ and ___ respectively.

• praseodymium; gadolinium

• gadolinium; germanium

• gallium; germanium

• praseodymium; gallium

The atomic mass of Sr as predicted according to the Dobereiner's law of triads in the triad Ca(Z=40), Sr, Ba(Z=137)is ___.

• 80

• 88

• 100

• 85

What is the element symbol of Bromine?

• Be

• Br

• B

• Bi

The element that has the latin name “Argentum” is

• Tin

• Silver

• Oxygen

• Potassium

The period number tells us...

• How many shells an element has

• How many electrons are in the most outer shell

• The mass number

• The valency