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प्रश्न
Right or wrong sentence.
The modern periodic table has 1 to 7 periods.
पर्याय
Right
Wrong
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उत्तर
The given sentence is wrong.
Explanation:
The modern periodic table has seven periods. The horizontal rows are called periods; the lanthanide and actinide rows are often shown separately but belong to periods 6 and 7.
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संबंधित प्रश्न
State modern periodic law.
Fill in the following blank with suitable word:
Group 1 elements are called ...............
On which side of the periodic table will you find metals?
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.
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
On the basis of electronic configuration, how will you identify chemically similar elements?
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
What are the merits of the modern periodic table of elements?
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
Name two elements in each case:
Transition element
Name the type of elements which have two electrons in the outermost orbit.
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
What is the main characteristic of the last element in each period of the periodic table?
What is meant in the periodic table by a period?
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.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Zinc
Give the symbol and valency of the following element and radical.
Bisulphite
Give the chemical formula of sodium hydroxide
Give the chemical formula of calcium phosphate
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
The groups 1 and 2 constitute the ______ block.
Which of the following statements about the Modern periodic table is correct?
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
Write an explanation.
Period
Elements in the modern periodic table are arranged in ______groups and______ periods.
What are groups and periods in the modern periodic table?
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
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?
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
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.
Answer the following in respect of element \[\ce{_16^32S}\].
To which group and period does it belong?
