Question: How Many Elements Are There In First Period?

What are the elements in the first period?

The simplest atoms, hydrogen and helium, are found in row 1, or the first period.

These atoms have electrons occupying the energy level n=1.

Moving down, row 2, or period 2, contains the elements Li (lithium) through Ne (neon)..

Which element is in group 14 Period 5?

TinTin. Tin is a chemical element with the symbol Sn (for Latin: stannum) and atomic number 50. It is a main group metal in group 14 of the periodic table.

Is 7th period radioactive?

Properties. All elements of period 7 are radioactive. This period contains the actinides, which includes plutonium, the naturally occurring element with the heaviest nucleus; subsequent elements must be created artificially.

Is 7th period complete?

4 New Elements Are Added To The Periodic Table : The Two-Way With the discoveries now confirmed, “The 7th period of the periodic table of elements is complete,” according to the International Union of Pure and Applied Chemistry.

What’s the longest period?

How long is too long? Generally, a period lasts between three to seven days. A menstrual period that lasts longer than seven days is considered a long period. Your doctor may refer to a period that lasts longer than a week as menorrhagia.

How many elements are present in first period?

First there is the hydrogen period, consisting of the two elements hydrogen, 1, and helium, 2. Then there are two periods of eight elements each: the first short period, from lithium, 3, to neon, 10; and the second short period, from sodium, 11, to argon, 18.

How many elements are there in second period?

Period 2 elements obey the octet rule in that they need eight electrons to complete their valence shell, where at most eight electrons can be accommodated: two in the 2s orbital and six in the 2p subshell….Period 2 element.HydrogenRubidiumStrontiumYttriumZirconiumNiobium5 more columns

Which is shortest period?

The first period of the periodic table is the shortest period of the periodic table.

Why does Period 2 have 8 elements?

There are 8 elements in period 2 because all those elements have electrons in the second shell and no electrons in the third shell.

What is the period number of oxygen?

2Fact boxGroup16Melting pointPeriod2Boiling pointBlockpDensity (g cm−3)Atomic number8Relative atomic massState at 20°CGasKey isotopes2 more rows

Why are hydrogen and helium alone on their row?

Atomic hydrogen wants to combine with other elements to fill its outer shell. … Helium (He) is different from all of the other elements. It is very stable with only two electrons in its outer orbital (valence shell).

What is the group and period of hydrogen?

HydrogenGroup1: H and alkali metalsPeriodperiod 1Blocks-blockElement categoryReactive nonmetal42 more rows

How many elements are in the period?

118There are currently seven complete periods in the periodic table, comprising the 118 known elements.

Why does the first period have 2 elements?

There are only two elements in the first period: hydrogen and helium. … This is because in quantum physics, this period fills up the 1s orbital. Period 1 elements follows the duet rule, they only need two electrons to complete their valence shell. These elements can only hold two electrons, both in the 1s orbital.

What is the period of helium?

Helium is the second element on the periodic table. It is located in period 1 and group 18 or 8A on the righthand side of the table. This group contains the noble gases, which are the most chemically inert elements on the periodic table.

What element is found in Group 2 and Period 4?

element zirconiumThis is the element zirconium , Zr . You should not have to remember these symbols, because a Periodic Table should always be supplied.

Which period is the shortest name the element in this period?

The first period of the periodic table is the shortest period of the periodic table and contains 2 elements. The sixth period period of the periodic table is the longest period of the periodic table and contains 32 elements.

What is the period for hydrogen?

Fact boxGroup1−259.16°C, −434.49°F, 13.99 KPeriod1−252.879°C, −423.182°F, 20.271 KBlocks0.000082Atomic number11.008State at 20°CGas1H, 2H2 more rows