3. Name the following
(i) The scientiest who gave octave law.
(ii). The most reactive non-metal.
(iii) Base of Mendleev periodic table.
(iv) The smallest atom?
Answers
Explanation:
Answer 》
Q . 1 》 The scientiest who gave octave law.
Answer 》 Law of octaves, in chemistry, the generalization made by the English chemist J.A.R. Newlands in 1865 that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements.
Q . 2 》 The most reactive non-metal.
Answer 》
element fluorine
Since the noble gases are a special group because of their lack of reactivity, the element fluorine is the most reactive nonmetal. It is not found in nature as a free element. Fluorine gas reacts explosively with many other elements and compounds and is considered to be one of the most dangerous known substances.
Q . 3 》Base of Mendleev periodic table.
Answer 》 In Mendeleev's periodic table, elements were arranged on the basis of the fundamental property, atomic mass, and chemical properties. During Mendeleev's work, only 63 elements were known.
Q . 4 》 The smallest atom?
Answer 》 An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.
Hope it's helpful for you ✌✌
A1) J.A.R. Newlands
A2) element fluorine
A3) In Mendeleev's periodic table, elements were arranged on the basis of the fundamental property, atomic mass, and chemical properties. During Mendeleev's work, only 63 elements were known.
A4) Helium
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More information ⤵️⤵️
Ans1) J.A.R. Newlands
more information ⤵️
Law of octaves, in chemistry, the generalization made by the English chemist J.A.R. Newlands in 1865 that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements.
Ans2) element fluorine
more information ⤵️
Since the noble gases are a special group because of their lack of reactivity, the element fluorine is the most reactive nonmetal. It is not found in nature as a free element. Fluorine gas reacts explosively with many other elements and compounds and is considered to be one of the most dangerous known substances.
Ans3) In Mendeleev's periodic table, elements were arranged on the basis of the fundamental property, atomic mass, and chemical properties. During Mendeleev's work, only 63 elements were known.
Ans4) Helium
more information ⤵️
On the periodic table of the elements, atom size tends to increase when moving down columns, but decrease when moving across rows (left to right). Consequently, the smallest atom is helium with a radius of 32 pm, while one of the largest is caesium at 225 pm.