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Their outermost electrons are in the same shell. For example, Helium and Hydrogen have 1 and 2 electrons respectively, and these electrons exist within the first electron shell. Lithium has 3 electrons and the third of these electrons is in the second electron shell, and so, it is a member of the 2nd period of the Periodic Table.

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13y ago
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14y ago

They have the same number of valence electrons in their outermost shell.

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13y ago

The same shell

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Q: What do atoms in the same period have?
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Related questions

Are atoms of nonmetals among the largest atoms?

Atoms of nonmetals tend to be smaller than atoms of metals in the same period.


What do atoms of the same period have in common?

They all have the same number of energy levels. That's about it.


What do all the atoms in the same period have in common?

All member of the same period share the same number of energy levels. The energy levels range from one up to seven.


What is the element in the fourth period whose atoms have the same number of electrons in their highest energy levels that tins atoms do?

bromine, i think


How is the number of energy levels in an atom related to the periodic number?

The period number is the same as the highest energy level containing electrons for the atoms in that period.


How many atoms are larger than Ca and in the same period as Ca?

There are 17 elements larger than calcium (Ca) on the periodic table in calcium's period.


Fr9m left to rigth in a period the size of atoms?

From left to right in a period the size of the atoms decreases.


What is the element in the fourth period whose atoms have the same number of electrons in their highest energy levels at that tins do?

bromine, i think


Atoms of the same element always have the same number of what?

All atoms of a given element have the same number of protons in a nucleus. It is the number of protons in an atom's nucleus that determines the elemental identity of any atom. Period.


How many atoms fit across the period at the end of this sentence?

Assuming you are talking about a period made by carbon atoms (Pencil lead is almost pure carbon) and that period has a mass of 0.0001g Then the answer is 5x1018 atoms.There are 12.011g of carbon per mol, there are 6.022x1023 atoms per mol.1mol | 6.022x1023 atoms | 0.001 g |-----------|--------------------------|-------------| = 5x1018 atoms/period12.011g | 1 mol | period |


What do you notice about the number of energy levels in an atom of an element in the period the element is in?

The atom of an element in the third period of the Periodic Table has 3 energy levels and so on. Also, atoms of elements in the same group have the same no. of valence electrons.


What atoms have the same atomic number?

Atoms of the same Element have this.