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Similarity and Difference of Hydrogen with Alkali Metals

Which is the ...

Question

Which is the element with atomic number 57

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Solution

Element with atomic number 57 is Lanthanum.
It is a metal commonly used in alloys which can be found in Cigarette lighters. The alloy name is Misch metal

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Similar questions

Q. A and B are two elements which have same atomic weight and are having atomic number 27 and 30 respectively. If the atomic weight of A is 57 then number of neutron in B is :

Q. Question 21
Which of the following elements will form an acidic oxide?

(a) An element with atomic number 7
(b) An element with atomic number 3
(c) An element with atomic number 12
(d) An element with atomic number 19

Q. An element with atomic number

17

is placed in the group

17

of the long from periodic table. Element with atomic number

9

is placed above and with atomic number

35

is placed below it. Element with atomic number

16

is placed left and with atomic number

18

is placed right to it. Which of the following statements are correct?

a) Valency of the element with atomic number

18

b) Elements with same valency will have atomic number

16

17

18

.

c) Valency of element with atomic number

9

17

35

d) Element with atomic number

17

is more electronegative than element with atomic number

16

35

Q. An element with atomic number

17

is placed in the group

17

of the long form periodic table. Element with atomic number

9

is placed above and with atomic number

35

is placed below it. Element with atomic number

16

is placed left and with atomic number

18

is placed right to it. Which of the following statements are correct:
(i) Valency of the element with atomic number

18

0

(ii) Elements with same valency have atomic number

16, 17

18

(iii) Valency of elements with atomic number

9, 17

35

is one
(iv) Element with atomic number

17

is more electronegative than elements with atomic number

16

35

Q. The wavelength of the

K_{α}

line for an element of atomic number 57 is

λ

. The wavelength of the

K_{α}

line for the element of atomic number 29 is…

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