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Question

name the element in correct order of their increasing atomic number present in first, second ,third shrt period of the periodic table .state each element electronic configuration

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Solution

The elements belonging to the first three periods are those of atomic number 1 to 20, details of which are given in the link below:-

Electronic configuration of elements:

Element Atomic number
Electronic configuration

K L M N O

hydrogen 1 1

helium 2 2

lithium 3 2 1

beryllium 4 2 2

boron 5 2 3

carbon 6 2 4

nitrogen 7 2 5

oxygen 8 2 6

fluorine 9 2 7

neon 10 2 8

sodium 11 2 8 1

magnesium 12 2 8 2

aluminum 13 2 8 3

silicon 14 2 8 4

phosphorous 15 2 8 5

sulphur 16 2 8 6

chlorine 17 2 8 7

argon 18 2 8 8

potassium 19 2 8 8 1

calcium 20 2 8 8 2

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Similar questions

Q. The following table represents the first three periods of the modern periodic table. Study the table and answer the questions that follow:
(i) Write the formula of the sulphate of the element with atomic number 13.
(ii) What type of bonding will be present in the oxide of the element with atomic number 1?
(iii) Which feature of the atomic structure accounts for the similarities in the chemical properties of the elements in group VIIA of the periodic table?
(iv) Name the element which has the highest ionization potential.
(v) How many electrons are present in the valence shell of the element with atomic number 18?

Figure

(vi) What is the name given to the energy released, when an atom in its isolated gaseous state accepts an electron to form an anion?
(vii) What is the electronic configuration of the element in the third period which gains one electron to become an anion?
(viii) Fill in the blanks:
The atomic size ________ as we move from left to right across the period, because the ________ increases, but the ________ remains the same.

Q. Assertion :In the present form of periodic table, the period number corresponds to the highest principal quantum number of the elements in the period.
Reason: Elements having similar outer electronic configurations in their atoms belong to same period.

Q. The electronic configuration of an element is

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}

. The atomic number of the element which is just below the above element in the periodic table is :

Q. In modern periodic table, arrange the third row elements Na, Mg, AI and Si in the increasing order of their atomic size.

Q. The electronic configuration of an element is

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{3}

. Which is the atomic number of the element which is just below the above element in the periodic table?

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