0
Why was basis of classification of element in the periodic table changed from atomic mass to atomic number?
Wiki User
∙ 11y ago
Mendeleev's Periodic Table was based on the atomic masses of elements. However, this was not effective when isotopes were discovered. An isotope of an element is defined as the element having the same atomic number but varying mass numbers. So, mass numbers weren't constant and hence, a better characteristic was chosen -atomic number. Atomic number of any element was a characteristic of a particular element. Hence atomic numbers were taken as the basis of classification instead of atomic masses.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
What element on the periodic table weighs 19.32?
No element has an atomic weight of 19.32 on the periodic table.
What is the atomic mass of an element listed in the periodic table?
The atomic mass is the combined mass of the protons, neutrons and electrons in an element. It can be found below the element's symbol on the periodic table.
What element is the first on the periodic table?
Hydrogen is the first element on periodic table. Its atomic number is 1.
Which element has the atomic nunber 1 and also comes first on the Periodic Table?
Hydrogen is the element having atomic number1 and comes first in the periodic table.
Can you find the atomic number of an element on the periodic table?
Atomic number of an element can be found on the periodic table. It is located at the upper left-hand corner of the table.
What is the element of classification for chlorine?
the atomic number is 17 and the mass number is 35.5, it is in group 7 on the periodic table
What is the atomic number on the periodic table?
The atomic number on the periodic table is the number of protons for the element.
What is the atomic number of an element listed in the Periodic Table refers to?
The atomic umber of an element listed in the periodic table refers to number of protons in the element. Atomic number is equal to number of protons.
What element has a relative atomic mass of 15.5?
Relative atomic mass, also called atomic weight, is listed on the periodic table for each element. There is no element listed on the periodic table with a relative atomic mass of 15.5.
What element on the periodic table weighs 19.32?
No element has an atomic weight of 19.32 on the periodic table.
Is the atomic number of each element included in the periodic table?
YES!!! The atomic No. is the postition of the element in the periodic table. It also indicates the number of protons in the element and electrons in the neutral element. The Atomic Mass is also included in the periodic table. The Atomic Mass is the sum of all the protons and neutrons of an element in the periodic table. Here are some examples. Hydrogen ; [1/1]H The first element in the table Carbon ; [12/6]C The sixth element in the periodic table Oxygen ; [16/8]O The eighth element in the periodic table et.seq., The first number given is the Atomic Mass and the second number is the Atomic Number.
What does the periodic table contain?
The four pieces of information in each box of most periodic tables are the element's name, the element's symbol, the element's average atomic weight and the element's atomic number. Other periodic tables have other information, but standard periodic tables almost always have those four.
What is zinc classification on the periodic table?
* Name: Zinc * Symbol: Zn * Atomic number: 30 * Atomic weight: 65.409 (4) * Group in periodic table: 12 * Period in periodic table: 4 * Block in periodic table: d-block
Was the first element on the periodic table of elements carbon?
NO!!! Hydrogen (H) is the first element on the Periodic Table. Reason Atomic No. = 1 Atomic mass( of protium) = 1 Carbon lies 6th position. Atomic No. = 6 Atomic mass = 12
What is the atomic mass of an element listed in the periodic table?
The atomic mass is the combined mass of the protons, neutrons and electrons in an element. It can be found below the element's symbol on the periodic table.
What element is the first on the periodic table?
Hydrogen is the first element on periodic table. Its atomic number is 1.
What does the atomic number show you about the element on the periodic table?
The atomic number is the number of protons present in the element.
