Chemistry
An element with atomic number 19 will most likely combine chemically with the elements whose atomic number is :
- 17
- 11
- 28
- 20
Periodic Table
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Answer
17
Reason — Element with atomic number 19 has an electronic configuration of 2, 8, 8, 1. It is a metal with one valence electron. Element with atomic number 17 has an electronic configuration of 2, 8, 7. It is a non-metal. Hence, element with atomic number 19 will donate its one valence electron to element with atomic number 17. Both will achieve stable octet. Hence, these two elements are most likely to combine chemically.
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Related Questions
An element A belonging to period 3 and group II will have :
- 3 shells and 2 valence electrons
- 2 shells and 3 valence electrons
- 3 shells and 3 valence electrons
- 2 shells and 2 valence electrons
Among the elements given below, the element with the least electronegativity is :
- Lithium
- Carbon
- Boron
- Fluorine
Parts (i) to (iv) refer to changes in the properties of elements on moving from left to right across a period of the Periodic Table. For each property, choose the correct answer.
(i) The non-metallic character of the elements :
- decreases,
- increases,
- remains the same,
- depends on the period
(ii) The electronegativity :
- depends on the number of valence electrons,
- remains the same,
- decreases,
- increases
(iii) The ionization potential :
- goes up and down
- decreases
- increases
- remains the same
(iv) The atomic size :
- decreases,
- increases,
- remains the same,
- sometimes increases and sometimes decreases
In the periodic table while going down in the halogen group :
- reactivity will increase
- electronegativity will increase
- ionic radius will increase
- ionisation potential will increase