Question

Metal x form coloured iones is paramagnetic and is used as catalyst perdict the block to which metal belongs

Answer 1

Answer:

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${4 \times \sqrt{4312. { {5 {20 { {5}^{2} \times \frac{?}{?} }^{2} }^{2} \times \frac{?}{?} }^{2} }^{2} } }^{2}$

Answer 2

Answer:

Classification of elements and periodicity in properties

One mark questions:

1. For the triad of elements A, B and C if the atomic weights of A and C are 7 and 39.

Predict the atomic weight of B.

2. “Every eighth element has property similar to the 1st element when placed

(arranged) in increasing order of their atomic weight”. Name the law for the above

statement.

3. Which property of the element was the basis for the classification of elements by

Mendeleev?

4. State Mendeleev’s periodic law.

5. Name the scientist whose experiment on x-ray spectra of elements led to modern

periodic law.

6. State modern periodic law.

7. What is more fundamental property for an atom of an element according to

Moseley?

8. Which quantum number corresponds to the period number in the modern periodic

table?

9. How many elements are there in the 4th period of long form of periodic table?

10.Write the atomic number of the element unniltrium.

11.Give the IUPAC name of the element whose atomic number is 109?

12.Which one of the following subshell is not filled in the 5th period (5s, 5p, 5d, 4d)?

13.In which period does the lanthanoids appear?

14.In which period does the actinide series of elements appear?

15.Name the series of inner transition element found in the 7th period.

16.How many elements are in lanthanide series?

17.Elements of a group have similar chemical properties. Why?

18.The position of helium is in 18th group of p block and not in 2nd group of s block of

long form of periodic table. Justify the statement.

19.To which block of the periodic table do the elements of group-I and II belong?

20.How many groups of elements form p block of the periodic table?

21.What are ‘representative elements’?

22.Which group of elements are called ‘chalcogens’?

23.Write the general outer electronic configuration of d block elements.

24.Which block of elements are more known for exhibiting paramagnetism and

catalytic properties?

25.A metal X forms coloured ions, is paramagnetic and is used as a catalyst. Predict

the block to which the metal belongs.