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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

In the Modern Periodic Table – Atoms of All Elements Are Arranged According to Their Increasing Order of – Atomic Numbers. an Atom of Nitrogen Has Seven Protons and Seven Electrons.

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प्रश्न

In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.

तक्ता
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उत्तर

Atomic number Number of protons Number of electrons
Z p e
Nitrogen atom has 7 Protens 7 electrons

∴ Atomic number [Z] = no. of protons [p] = no. of electrons [e]

Z = 7 = 7

∴ Atomic number of nitrogen is 7.

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पाठ 4: Atomic Structure - Exercise

संबंधित प्रश्‍न

What is the usual number of valence electrons and valency of group 18 elements of the periodic table?


 What is the number of elements is 1st period the modern periodic table?


Name two elements in each case: 

Transition element


An element E has following electronic configuration:

K

L

M

2

8

6

(a) To which group of the periodic table does element E belong?

(b) To which period of the periodic table does element E belong?

(c) State the number of valence electrons present in element E.

(d) State the valency of the element E.


Find the odd one out and give its explanation.


______ is the longest period in the periodical table.


Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?


Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.

It has variable valency and is a member of the Oxygen family (group 16).


A part of modern periodic table is given below. On its basis, answer the following questions:

Group No. → 1 2 13 14 15 16 17 18
Period ↓
2   A       B    
3 E     D     F C

Write the molecular formula of the compound formed by the combination:

E and B


A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).

Boron, Aluminium, Gallium, Indium, Thallium

Answer the following question in relation to the above group of elements:

If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?


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