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Helium has the smallest atomic size among elements in the first four periods of the Periodic Table. It has the smallest atomic radius due to its high effective nuclear charge and low electron-electron repulsion.
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What is the d block element with the smallest atomic number?
Scandium. Its atomic number is 21. It is the first d block element.
How are the periods on the periodic table numbered?
The elements are listed in the order of how many atoms they have. For example, hydrogen is the first element on the periodic table. Hydrogen is the smallest element, and has one atom.
When did the atomic number first appear on the periodic table?
The first atomic number appeared on the periodic table in August 1982. The first atom of the element meitnerium had the atomic number 109. The isotope of element 109 has an atomic mass of 266.
What is the element of a atomic number element?
The atomic number of an Element refers to it's position in The Periodic Table. The first element (Hydrogen - H) has the atomic number 1. The second element (Helium - He) has the atomic number 2. The fifty-second element (Tellurium - Te) has the atomic number 52. And so on.
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.
What is the d block element with the smallest atomic number?
Scandium. Its atomic number is 21. It is the first d block element.
Why is hydrogen the 1st element?
Hydrogen is the first element because it has the simplest atomic structure with just one proton in its nucleus. This makes it have the smallest atomic number, which determines the element's position in the periodic table.
What is the first element in the group 1?
The first element is hydrogen.Its atomic no. is 1 and atomic mass is 1.008.
What is the element first used for fission in the atomic bomb production?
The element first used for fission in an atomic bomb is uranium.
Do Hydrogen have the smallest atomic number?
Yes. On the Periodic Table, it's the first element listed due to the fact it has only one electron and one proton.
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
How are period arranged on the periodic table?
The elements are arranged in order of increasing atomic number in the Periodic Table. The rows are called periods and the columns are called groups.
This element has the smallest atoms of all the elements?
Hydrogen has the smallest atoms of all the elements. It consists of only one proton and one electron, giving it the smallest atomic radius among all elements.
When did the atomic number first appear on the periodic table?
The first atomic number appeared on the periodic table in August 1982. The first atom of the element meitnerium had the atomic number 109. The isotope of element 109 has an atomic mass of 266.
How are the periods on the periodic table numbered?
The elements are listed in the order of how many atoms they have. For example, hydrogen is the first element on the periodic table. Hydrogen is the smallest element, and has one atom.
What is the element of a atomic number element?
The atomic number of an Element refers to it's position in The Periodic Table. The first element (Hydrogen - H) has the atomic number 1. The second element (Helium - He) has the atomic number 2. The fifty-second element (Tellurium - Te) has the atomic number 52. And so on.
Is hydrogen atomic radius the lowest?
Yes, hydrogen has the smallest atomic radius of all the elements due to its position as the first element in the periodic table and its single electron occupying the 1s orbital.
