What element is the first element in the fourth period?

It is titanium.

The A is Potassium

Period four elements fill 4s shells then 3d then 4p. The first element in this particular period is potassium.

The first element in the fourth period, which is used in making fertilizer, is potassium.

This element is potassium (K).

Potassium.

The element in the fourth period is an exception to the Aufbau principle is Cr. Each period in the periodic table corresponds to a principal energy level.

It is in period 4.

That would be the element, Titanium with a atomic number of 22. Remember, periods are horizontal and to get to the fourth element simply count over four.

The first element in a period is an alkali metal.

Germanium is in the fourth period with 4 valence electrons.

Kr fourth period means the fourth horizontal row on the periodic table....so the element on that row with the highest atomic number is Kr

The fourth electron shell is filled by krypton. Krypton is the last element in the fourth period on the periodic table. Each of the periods represents an electron shell. Elements in the first period have electrons in the first shell; elements in the second period have electrons in the second shell; and so on.

In the periodic table, a group is a column of elements and a period is a row. The element in the 14th column and fourth row is germanium.

Four shells, as potassium is in fourth period

the fourth elements or the fourth dimension in the relativity is time. The space are the first three dimensions.

Element #32 is Germanium, symbol Ge. It is a semi-metal used in some semiconductor materials. It is in the fourth period of the period table (assuming H and He are the first period).

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

This chemical element is potassium (K).

Selenium, which is in the same group as oxygen.

The first period in which you'll find 18 elementS is 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.

Not necessarily, the number of electrons depend on the period in which the element is contained. For instance the first period ends at 2, second and third at 8, fourth and fifth at 18, sixth and seventh at 32.

In the most common modern wide form periodic table, iron is the first element in column 8 in the fourth period (row) of the table.

In the fourth period of the periodic table of elements, the most reactive element is potassium. It is an alkali metal, and it has the atomic number of 19.