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प्रश्न
An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is
विकल्प
17
11
18
20
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उत्तर
An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is 17.
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संबंधित प्रश्न
Give electron dot diagram of the following:
Magnesium chloride
How are X-rays produced?
What do you think would be the observation of `alpha` particle scattering experiment if carried out on (i) heavy nucleus like platinum (ii) light nuclei like litheum.
Explain fractional atomic mass. What is the fractional mass of chlorine?
Give reason
Argon does not react.
Explain
Octet rule for the formation of sodium chloride
Complete the following table relating to the atomic structure of some elements.
|
Element Symbol |
Atomic Number |
Mass Number |
Numbers of neutrons |
Number of Electrons |
Number of Protons |
|
Li |
3 |
6 |
|
|
|
|
Cl |
17 |
|
20 |
|
|
|
Na |
|
|
12 |
|
11 |
|
Al |
|
27 |
|
|
13 |
|
S |
|
32 |
16 |
|
|
\[\ce{^24_12Mg}\] and \[\ce{^26_12Mg}\] are symbols of isotopes of magnesium.
(a) Compare the atoms of these isotopes with respect to :
i. the composition of their nuclei
ii. their electronic configurations
(b) Give reasons why the two isotopes of magnesium have different mass numbers.
______ is the only noble gas that does not have eight electrons in its valence shell.
Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is a metal.
