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प्रश्न
The K and L shells of the elements Na and Mg contain electrons.
पर्याय
Right
Wrong
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उत्तर
The K and L shells of the elements Na and Mg contain electrons- Right
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संबंधित प्रश्न
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
Fill in the following blank with suitable word:
Group 1 elements are called ...............
Give two example of group 17 elements.
Give two example of group 18 elements.
How were the positions of isotopes of an element decided in the modern periodic table?
On which side of the periodic table will you find non-metals?
Which element has the electronic configuration 2, 8, 2?
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
What are the merits of the modern periodic table of elements?
(b) What is the number of elements is 3rd period, the modern periodic table?
What are the periods in a periodic table? Give two characteristics of each.
Name two elements in Inert gas.
Name two elements in each case:
Actinides
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
How will the tendency to gain electrons change as we go from left to right across a period? Why?
What is the number of elements in the 1st period?
The horizontal rows in a periodic table are called _____.
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the chemical formula of sodium bicarbonate
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
State the number of elements in Period 3 of the Periodic Table.
What are the elements.
What are the periods in a periodic table?
Find the odd one out and give its explanation.
The modern periodic table is divided into which blocks?
Write scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Which of the following elements will form an acidic oxide?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
Group 16 elements are collectively called as ______.
______ group elements are called alkaline earth metals.
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 Metalloid?
State the group and period, of the element having three shells with three electrons in valence shell.
Name the metalloids in the first twenty elements.
Match the atomic number with the following:
An element of group 2.
