Doberiener's taids
Which set of traids does not fit Doberiener's law of traids????
1. lithinum,sodium, potassium 2. Calcium, strontinum, barium 3.phosphorous, arsenic, antinomy 4.chlorine,bromine, iodine
Option c is correct.because it does not exist from Doberiener's traid law
Newlands theory is called
1.musical law 2.law of octaves 3.periodic law 4.atomic mass law
Option 2. is correct answer
When mendeleev start hod work how many elements were known????
1. 75 2.63 3.62 4.60.
Option 2. Is correct answer 63
How many elements were there in modern periodic table
1. 116 2. 112 3. 118 4. 108
Option 3rd is correct answer 118
In which order do we need to put sodium, potassium, lithium for Doberiener's traid?
1. Lithium,sodium,potassium 2.sodium, lithium, potassium 3.potassium, sodium, lithium 4.sodium, potassium, lithium
Option 1 is correct lithium, sodium, potassium.
Newland compare to the octaves found in which?
1.instruments 2.music 3. Singing 4.guitar
Option 3. Is correct answer singing
Vertical columns and horizontal rows known as?
Horizontal rows known as periods and vertically coloumn are known as groups.
How many elements are natural in modern periodic table?
1.94 2.96 3.92 4.98
Option 3rd is correct answer only 92 elements are natural in modern periodic table and other are made by scientists.
On what basis were the arranged in Doberiener's traids?
1.Atomic number 2.atomic mass 3.electron number 4.electron mass.
Option 2 is correct atomic mass.
did Newlands use Doberiener's traids of law in his classification?
Yes he use Doberiener's traids in his law of octaves because he use the elements that Doberiener's use.
According to mendeleev periodic law,the elements were arranged in periodic table according to.
1.increasing atomic number 2.decreasing atomic number 3.increasing atomic masses 4.decreasing atomic masses
Option 3.is correct answer increasing atomic masses
Name the two elements you would accept to show chemical reactions similar to magnesium?
1.Na,Sr 2. Li,o 3. Be,Ca
Option 3rd is correct answer because beryllium and calcium are in same group in which magnesium is present they all are in from group 2
In which year Doberiener's tried to arrange the elements into groups?
1. 1812 2. 1817 3.1823 4.1825.
Option 2 is correct Doberiener's tried in year 1817 to arrange the elements into groups.
How many elements present at Newlands time of discovery?
1.52 2.54 3.58 4.56
Option 4. Is correct answer 56. Elements what present at that times continue
Besides gallium, which other elements have since been discovered that were left by mendeleev in his periodic table?
1.neon 2.argon 3.helium 4.scandium
Option 4.is correct answer scandium is discovered other than gallium.
Which element has
1. Two cells, both of which are completely filled with electrons?
2. The electronic congrats configuration 2,8,2?
No 1. Neon has two cells which are completely filled.
2. Magnesium has the electronic configuration 2,8,2
Why Doberiener's classification of traids found to be use full?
Doberiener's could identify only three traids from the elements known at that time hense this system of classification into traids was not found to be useful.
Give to drawbacks or limitations of Newlands law of octaves?
It was found that the law of octaves was applicable only upto calcium, as after calcium every eighth elements did possess properties similiar to that to the first.
2.it was assumed by Newlands that only 56 elements existed in nature and no more elements would be discovered in the future.but,later in several new elements were discovered, whose properties did not into the law of octaves.
Which criteria did Mendeleevs use to make his periodic table?
When elements are arranged in the order of increasing atomic masses the element with similar properties occur at regular intervals the the properties of elements are periodic function of their atomic masses
On on what basis Henry Moseley made the modern periodic table?
Henry mosely showed that the atomic number of an element is a more fundamental property than its atomic mass.