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Only the two with the smallest atomic numbers, hydrogen and helium. This corresponds to the fact that the innermost shell of electrons can contain only two electrons.

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13y ago
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5mo ago

There are 2 elements in the first period of the Periodic Table: Hydrogen and Helium.

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14y ago

two;hydrogen and helium

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Q: How many elements are there in the first period of periodic table?
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Related questions

What kind of shell does the first period in the periodic table have?

The first period of the periodic table's elements all have 1 energy level.


How many elements occur in each of the first three periods or the periodic table?

The first period of the periodic table has 2 elements, the second period has 8 elements, and the third period has 8 elements as well.


How many elements make up period 6 in the periodic table?

Period 6 of the periodic table consists of 32 elements.


Elements on very first Periodic Table?

Yes, there were elements on the first periodic table. I believe that there are still elements on the periodic table.


In the periodic table what is a period?

A period in the periodic table is a row of elements that share the same number of electron shells. Elements within the same period have the same highest energy level.


How many elements are in the 1st row of the periodic table?

In the Periodic Table of Elements there are: 118 Observed Elements 114 Officially Discovered Elements 112 Officially named Elements 92 Naturally Occuring Elements 83 Non-radioactive elements


Is xenon in the first period of the periodic table?

No. Xenon is not the first period of the periodic table. It is placed in the 5th period of periodic table.


Does the periodic table explain the shell model or does the shell model explain the periodic table?

The shell model explains the periodic table. It describes how electrons are arranged in energy levels (shells) around the nucleus, influencing the chemical properties and behavior of elements. This organization of electrons into shells follows patterns that are reflected in the periodic table.


What element is its row in the periodic table?

An elements period is its row in the Periodic Table.


An element in its row in the periodic table?

An elements period is its row in the Periodic Table.


How many elements are there in the third period of the periodic table?

There are 8 elements in the third period of periodic table. The elements belong to group-1,2,13,14,15,16,17 and 18


Which element is located in period 1 of the periodic table?

Hydrogen is located in period 1 of the periodic table. It is the first element and has an atomic number of 1.