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Modern Periodic Table

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Question

Write down the word that will correctly complete the following sentences:
Relative atomic mass of a light element up to calcium is approximately.........its atomic number.

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Solution

Relative atomic mass of a light element up to calcium is approximately $20$ its atomic number.

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Q. Relative atomic mass of calcium is approximately _______ its atomic number.

Q. Copy and complete the following sentences choosing the correct word or words from those given in the brackets, at the end of each sentence:
(1) The properties of the elements are a periodic function of their _________ (atomic number, mass number, relative atomic mass).
(2) Moving across a ________ of the periodic table, the elements show increasing _______ character (group, period, metallic, non-metallic).
(3) The element at the bottom of a group would be expected to show ________ metallic character than the element at the top (less, more).
(4) The similarities in the properties of elements belonging to a group is because they have the same _________ (electronic configurations, number of outer electrons, atomic number).

Q. The atomic weight of an unknown element, in atomic mass units (amu), is approximately

20 %

less than that of calcium. The atomic weight of calcium is

40

amu. Which of the following best approximates the atomic weight, in amu, of the unknown element?

Q. Complete the following sentence :

The mass number and atomic number of an element are not changed when it emits _______.

Complete the following sentence :

The atomic number of a radioactive element is not changed when it emits________.

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