How many valence electrons do group 2 have? (2024)

FAQs

How many valence electrons do group 2 have? ›

1 Answer. The alkaline earth metals have 2 valence electrons.

Period 2 elements (carbon, nitrogen, oxygen, fluorine and neon) obey the octet rule in that they need eight electrons to complete their valence shell (lithium and beryllium obey duet rule, boron is electron deficient.), where at most eight electrons can be accommodated: two in the 2s orbital and six in the 2p subshell.

Explanation: In group 2 of the periodic table, there are 2 electrons in the outer shell of each element. Group 2 elements are known as the alkaline earth metals and include elements like beryllium, magnesium, calcium, and strontium, among others.

We know the number of valence electrons by the main group number corresponding to each element. The main group elements excludes transition metals, so the main group is 1-2, 13-18. Group 1 has 1 valence electron, group 2 has 2, group 13 has 3, group 14 has 4, and so on until group 18 is seen to have 8.

Group 2 has 2 valence electrons.

Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴.

Helium is the only exception for the main group elements. The first energy level holds a maximum of two valence electrons. Since helium atoms only have two electrons and the outermost energy level is the first energy level, there can only be two valence electrons.

For example, Oxygen (atomic number = 8) has valency 2, as its electronic configuration is 2, 6. It accepts two electrons from other atoms to complete its outermost shell. So, the two examples for the element with valency 2 are Magnesium and Oxygen.

Second group elements Be,Mg,Ca,Ba,Ra have two Valence electrons. Zn, Cd,Hg also have two valence electrons.

Group 2 of elements on the periodic table refers to alkaline earth metals. They are beryllium, magnesium, calcium, strontium, barium, and radium.

Does Group 2 lose 2 electrons? ›

The alkali earth metals (group 2), such as, Mg or Sr lose two e-'s to attain the configuration of Ne. Thus, the group 2 metals tend to have a +2 charge.

Each group encompasses elements that have the same number of electrons in their valence (outermost) shell and therefore share similar chemical properties. For instance, all Group 2 elements (alkaline earth metals) have two valence electrons that influence their bonding with other elements.

Group #2 has 2 valence electrons.

The elements of groups \[1,2,13,14,15,16\] and $17$ are collectively called Representative or normal elements. So, the correct answer is Option B.

The group 15 elements consist of five valence electrons. Due to this, the elements can either lose five electrons or gain three electrons in order to attain the stable configuration.

Reactivity of Alkaline Earth Metals

All alkaline Earth metals have similar properties because they all have two valenceelectrons.

Group 2 elements are those in the second column of the periodic table, specifically beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Group 3 consists of three valence electrons. Group 4 electrons have 2-4 valence electrons. Group 5 valence electrons have between 2 and 5 valence electrons. Group 6 valence electrons have between 2 and 6 electrons.

The alkali earth metals (group 2), such as, Mg or Sr lose two e-'s to attain the configuration of Ne. Thus, the group 2 metals tend to have a +2 charge.