Quick Answer: Why Does Period 2 Have 8 Elements?

Do all elements in period two have two energy levels?

Number of energy levels in each period The atoms in the second period have electrons in 2 energy levels.

The atoms in the third period have electrons in 3 energy levels.

The atoms in the fourth period have electrons in 4 energy levels..

What number increases from 3/10 to Period 2?

In the periodic table, atomic number increases from 3 to 10 in period 2. Explanation: Atomic numnber is the total number of protons present in an atom. And, when we move across a period then there occurs an increase in atomic number of the elements.

What does the period number tell you?

Period number tells us how many electron shells, or orbits, or energy levels an element has. … Elements are grouped (put into columns) on the periodic table according to their properties.

What do periods and groups tell you?

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 are the 8 elements in period 2?

The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon. In a quantum mechanical description of atomic structure, this period corresponds to the filling of the second (n = 2) shell, more specifically its 2s and 2p subshells.

How many elements are there in second period?

8 elementsThe first period of the periodic table is a short one consisting of only two elements, hydrogen and helium. Lithium, atomic number 3 begins the second period, which has 8 elements. Elements with atomic numbers 4-10, which complete this period, are discussed in this section.

What element is in Period 2 Group 7?

Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

What element in Period 2 has the most mass?

1 Answer. The element in Period 2 with most mass is clearly the element with the highest atomic number, Z , and that is Ne , Z=10 , 21.08⋅g⋅mol−1 .

Do periods have similar properties?

All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor. Arranged this way, groups of elements in the same column have similar chemical and physical properties, reflecting the periodic law.

What element is Group 2 Period 2?

Group 2A — The Alkaline Earth Metals. Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Which is the shortest period?

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

What element in the second period has the largest?

LithiumLithium is the first element of the second period and atomic size decreases across the period. Therefore, Li has the largest size.