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प्रश्न
Mendeleev's periodic table : atomic mass : : Modern periodic table : _______
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उत्तर
Mendeleev's periodic table : atomic mass : : Modern periodic table : atomic number
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संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
Explain why All the elements of a period have different chemical properties.
State how the valency of elements varies in a group of the periodic table?
What is the number of elements is 1st period the modern periodic table?
(b) What is the number of elements is 3rd period, the modern periodic table?
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
Write a short note.
Structure of the modern periodic table.
What is meant in the periodic table by a period?
An element A has 2 electrons in its fourth shell. State its electronic configuration.
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.
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Ammonium
Give the symbol and valency of the following element and radical.
Bisulphate
The groups 1 and 2 constitute the _______ block.
The d-block elements are called as _______ elements.
p-block is composed of groups 1 and 2.
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element. Explain.
In the modern periodic table, elements are arranged according to their ______
Which of the following statements about the Modern Periodic Table is correct:
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
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 same valency as Lithium.
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).
Group 16 elements are collectively called as ______.
______ group elements are called alkaline earth metals.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
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 |
Which of the element is a Noble gas?
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly in both situations.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
Match the atomic number with the following:
A rare gas.
Match the atomic number with the following:
An element of group 2.
