The number of dots in the Lewis symbol represents:

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What will be the rate of the reaction if 5 g of magnesium is reacting completely with dilute hydrochloric acid in two minutes?

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Foils made of ___ was used in alpha-ray scattering experiments by Rutherford.

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How can you distinguish between dilute HCl and dilute HNO3?

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Destructive distillation of coal produces:

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The statement that is not true for the long form of the periodic table is

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if the atom of an element has atomic number 11 and mass number 23 find the number of protons electrons and neutrons in the atom

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Which among the given is formed when zinc reacts with dilute nitric acid?

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The atomic number of an element is 20. In modern periodic table, this element is placed in _______ .

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20 g silver nitrate solution is added to 20 g of sodium chloride solution what change in mass do you expect after the reaction and why

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Which of the following statement is correct?

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How many total metalloids are there in the periodic table ?

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Element X has electronic configuration 2, 8, 18, 8, 1. Without identifying X, (a) predict the sign and charge on a simple ion of X. (b) write if X will be an oxidising agent or a reducing agent. Why ?

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What important information is furnished about the nucleus of an atom by the alpha particle scattered experiment of Rutherford?

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We can easily move our hand in the air, but to do the same through a solid block of wood, we need a karate expert. Why? [2 MARKS]

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