answersLogoWhite

0


Best Answer

The first period in which you'll find 18 elementSis the fourth (4th) period: going from 19-K (potassium) to 36-Kr (Krypton).

Maybe this is the answer to the question you didn't ask but probably meant to ask.

(It is impossible for one element to contain 18 elements, you see!)

The element with 18 electrons in the 3rd period (= row) of the Periodic Table is Argon

In the first period of the periodic table there are only two elements: H (1 eln.) and He (2 eln's) and have nothing to do with the number 18.

User Avatar

Wiki User

13y ago
This answer is:
User Avatar
More answers
User Avatar

Wiki User

14y ago

The first row of the periodic table to have 18 elements is the third row, which ends with krypton, Kr.

This answer is:
User Avatar

User Avatar

Wiki User

13y ago

two elements 2 2 2 don't forget it! its very important

This answer is:
User Avatar

User Avatar

Wiki User

8y ago

Helium is in group 18 and period 1. It is the lightest of the noble gases.

This answer is:
User Avatar

User Avatar

Wiki User

8y ago

The element is Helium. It has chemical symbol He.

This answer is:
User Avatar

User Avatar

Wiki User

11y ago

Refer to the related link.

This answer is:
User Avatar

User Avatar

Wiki User

8y ago

This element is helium.

This answer is:
User Avatar

User Avatar

Wiki User

12y ago

Helium(He)

This answer is:
User Avatar
User Avatar

Anonymous

Lvl 1
3y ago
t

Add your answer:

Earn +20 pts
Q: Which element is in the first period and contains 18 elements?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

First element locate in period 3?

The first element in period three of the periodic table of chemical elements is sodium (Na).


The first period in the periodic table represents elements that possess only the first energy level s orbital therefore this period contains?

Two elements


How many elements are listed in period 4?

The fourth period contains 18 elements beginning with potassium and ending with krypton – one element for each of the eighteen groups. It sees the first appearance of d-block (which includes transition metals) in the table. Do You Agree? Sincerely, Jocelyn E.Flowers


The first period in the periodic table represents elements that possess only the first energy level s orbital therefore this period contains elements?

hydrogen and helium


What is the element in the fourth period on the periodic table of elements used to be first to make fertilizer?

Potassium is the element that used to be first to make fertilizer.


The first period in the peroidical table represents elements that possese elements only the first energy level is orbital thefore this perid contains?

two elements, hydrogen and helium.


The first period on the periodic table represents elements that possess only the first energy level s orbital therefore this period contains?

two


How many elements in the first period?

Period 1: 2 elements Period 2: 8 elements Period 3: 8 elements Period 4: 18 elements Period 5: 18 elements Period 6: 32 elements Period 7: 25 elements


Which period table group are made up of only gases?

The first period or row contains only elements that are gases at standard temperature and pressure.


Period in chemistry?

A period is a horizontal row on the periodic table of the elements. There are seven periods on the periodic table. Each period corresponds to the highest energy level that contains electrons. For example, the elements in the first period have electrons in the first energy level, which is the only energy level available; the elements in the second period have their highest energy electrons in the second energy level; the elements in the third period have their highest energy electrons in the third energy level, and so on.


What elements belong to the first period?

There are two elements in the first period, hydrogen and helium.


Since the first energy level contains only the 1s sublevel the number of elements in this period is?

2