What elements are in the first row of the periodic table? The first row has two elements—
hydrogen and helium
.
What are the 7 rows in the periodic table called?
The elements are arranged in seven horizontal rows, called
periods or series
, and 18 vertical columns, called groups.
Why there are 2 elements in 1st period?
There are two elements in the first period because
according to the quantum physics, the 1s orbital of this period is filled
. They follow a duet rule in which two electrons are present in the 1s orbital.
What are rows and columns in periodic table?
The vertical columns on the periodic table are called groups or families
because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.
What is group 1 in the periodic table?
Group 1 elements include the
alkali metals, Li, Na, K, Rb, Cs, Fr
. The alkali metals are all soft, shiny and metallic when cut. They react easily with water, have low melting points and densities, and are good conductors of electricity. They all have one valence electron that they lose easily to form ions.
As with any grid, the periodic table has rows running left to right, and columns running up and down.
The rows are called PERIODS and the columns are called GROUPS
. Hydrogen (H) is the first element in the periodic table because it has just one proton in its nucleus.
The number of rows and columns that a matrix has is called its dimension or its order. By convention,
rows are listed first
; and columns, second.
3. Hold down CTRL and press the down arrow key (cursor key) on the keyboard. You are taken to the bottom row. In the modern versions of Excel there are
1,048,576 rows
.
The elements in
group 2
(the second column) form compounds consisting of one atom of the element and two atoms of hydrogen: These are called alkaline earth metals, with similar properties among members of that group.
The second period contains the elements
lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon
.
The first three elements in Group 1 are
Lithium, Sodium and Potassium
and the three pictures below show the arrangement of electrons in their atoms.
The elements in the last group (column) of the Periodic Table are called
Noble Gases
.
By default, Excel uses the A1 reference style, which refers to columns as letters (A through IV, for a total of 256 columns), and
refers to rows as numbers (1 through 65,536)
. These letters and numbers are called row and column headings. To refer to a cell, type the column letter followed by the row number.
a noisy argument or fight
: My parents often have rows, but my dad does most of the shouting.
| Atomic number Name chemical element Symbol | 1 Hydrogen H | 2 Helium He | 3 Lithium Li | 4 Beryllium Be |
|---|
Period 2 only has two metals (lithium and beryllium) of
eight elements
, less than for any subsequent period both by number and by proportion. It also has the most number of nonmetals, namely five, among all periods.
