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The Elements of the Modern Periodic Table

The number of...

Question

The number of protons increases on moving from left to right across a period.

A

True

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B

False

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Solution

The correct option is A True

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Q. Assertion :Atomic size decreases across period but increases down a group of the periodic table. Reason: Moving from left to right across a period, electrons are added one at a time to the outer energy shell. Electrons within a shell cannot shield each other from the attraction to protons, while moving down a group in the periodic table, the number of electrons and filled electron shells increases.

Q. On moving across a period from left to right the ionisation energy increases because:

Q. Statement I: Atomic radius generally increases as you move across the periodic table from left to right.
Statement II: The atomic number is increasing from left to right as you move across the periodic table.

In the periodic table, the atomic radius increases from left to right.

The number of protons is increasing from left to right.

Q. Statement I: The ionization energy generally increases as you move from left to right across the periodic table.
Statement II: Shielding increases as you move from left to right across the periodic table.

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