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The number above the symbol is the atomic number, or the number of protons in the nucleus of one atom of the element. It is this number by which they organized the Periodic Table. If this number changes so does the identity of the element. In a balanced atom this number will also be the number of electrons in the electron cloud.
The number below is the Atomic Mass number, or the average number of particles (protons plus neutrons) in the nucleus. Since the number of neutrons can change this number must be given as an average so it may contain a decimal.
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Where are hydrogen found on the periodic table?
Hydrogen is found at the very top left of the periodic table. It is the first element on the periodic table and it is shown with the atomic symbol H.
What does the numbers on the side of the periodic table represent?
The period to which the element belongs
How will the modern periodic table be disturbed if isotopes of an element are discovered now?
The periodic table would be disturbed only if isotopes of a new element are discovered, because a periodic table is based on order of atomic number, not atomic mass. If new isotopes of a previously known element were discovered, the atomic mass shown in the periodic table might be changed, but this is very unlikely because the atomic masses shown in a periodic table are based on the naturally occurring distribution of isotopes, and any newly discovered isotopes would probably occur only in very small fractions of the total.
What is The first element on the periodic table of elements is hydrogen.?
The elements in the periodic table are arranged according to their atomic numbers, which are the numbers of protons in their atomic nuclei. The atomic number of hydrogen is 1 because it's atoms have one proton, which is why it's the first element in the periodic table.
Is carbon the first element on the periodic table of elements?
No, carbon is not the first element on the periodic table of elements. Hydrogen is the first element on the periodic table.
Where are hydrogen found on the periodic table?
Hydrogen is found at the very top left of the periodic table. It is the first element on the periodic table and it is shown with the atomic symbol H.
Is the atomic number the largest the two numbers shown in the periodic table?
The atomic number is the smaller of the two numbers shown in the periodic table. It represents the number of protons in the nucleus of an atom and determines the element's identity. The larger number, the atomic mass, is the sum of protons and neutrons in the nucleus.
What does the numbers on the side of the periodic table represent?
The period to which the element belongs
How will the modern periodic table be disturbed if isotopes of an element are discovered now?
The periodic table would be disturbed only if isotopes of a new element are discovered, because a periodic table is based on order of atomic number, not atomic mass. If new isotopes of a previously known element were discovered, the atomic mass shown in the periodic table might be changed, but this is very unlikely because the atomic masses shown in a periodic table are based on the naturally occurring distribution of isotopes, and any newly discovered isotopes would probably occur only in very small fractions of the total.
What do the numbers on mendeleev's periodic table represent?
The numbers on Mendeleev's periodic table represent the atomic number of each element, which is the number of protons in the nucleus of an atom. This number determines the element's identity and its placement in the periodic table.
What is The first element on the periodic table of elements is hydrogen.?
The elements in the periodic table are arranged according to their atomic numbers, which are the numbers of protons in their atomic nuclei. The atomic number of hydrogen is 1 because it's atoms have one proton, which is why it's the first element in the periodic table.
What element numbers on the periodic table of the elements are man made?
95- 118
Which element family is usually shown separated frome the main part of the periodic table?
f block elements (lanthanides and actinides) are placed below the periodic table
What is the name of the element As in the periodic table?
The element abbreviated with As on the periodic table is Arsenic
The average atomic mass grams shown on the periodic table for each element is also the mass of?
one mole of atoms of the element
Is carbon the first element on the periodic table of elements?
No, carbon is not the first element on the periodic table of elements. Hydrogen is the first element on the periodic table.
Is carbon the first element in the periodic table?
NO!!! Carbon is No. 6 in the Periodic Table. Hydrogen is No. 1 in the Periodic Table.
