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oee [108]
1 year ago
7

Why on moving from left to right in a period the chemical reactivity of element first decreases and then increases?

Chemistry
1 answer:
Helen [10]1 year ago
4 0

This phenomenon is known as the periodic trends in reactivity. It occurs because of the arrangement of electrons in orbitals.

As one moves from left to right across a period, the number of electrons in the outermost shell increases. These outermost electrons are involved in chemical reactions.

Therefore, as the number of outermost electrons increases, the reactivity of the element increases. However, the elements have filled shells, so beyond a certain point, the outermost shell will be full.

The reactivity then decreases as the electrons are no longer available to take part in chemical reactions. Therefore, the reactivity of the elements decreases from left to right in a period and then increases as the outermost shell begins to fill up again.

To know more about orbitals, click below:

brainly.com/question/20319149

#SPJ4

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This is takes into account how much of a substance should have been created (theoretical yield) and compares it to what was actually created (the actual yield).

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\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{molecular mass of element}}\times 100

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