What element has 2 valence electrons and is shiny? A: Calcium is a group 2 element with two valence electrons.
Which element has 2 valence electrons and is Period 4?
Means Calcium is an element which lies at Period 4 in Periodic table and having two valence electrons (Period 4 means 4th shell being occupied having 2 electrons in 4th or outermost shell)
Which of the following has Valency 2?
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 .
What are the Group 2 elements called?
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).
Is francium a metal?
francium (Fr), heaviest chemical element of Group 1 (Ia) in the periodic table, the alkali metal group .
Helium has two valence electrons.
| Element name Atomic number # of valence electrons | Helium 2 2 | Gold 79 2 | Carbon 6 4 | Calcium 20 2 |
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This first shell has only one subshell (labeled 1s) and can hold a maximum of 2 electrons . This is why there are two elements in the first row of the periodic table (H & He). Because the first shell can only hold a maximum of 2 electrons, the third electron must go into the second shell.
Neon, Z=10 , has eight valence electrons . This closed-shell configuration makes neon supremely difficult to oxidize, and difficult to reduce. The inertness, the lack of reactivity, of this Noble Gas, is a function of its electronic configuration.
Magnesium is alkaline earth metal and belongs to group IIA of the periodic table. It has two valence electrons which are present in 3s subshell.
The first energy level has 2 electrons located in the 1s-orbital and the second energy level, which in fluorine’s case is the outermost energy level, has 7 electrons, 2 in the 2s-orbital and 5 in the 2p-orbitals. This means that fluorine has a total of 7 valence electrons.
Magnesium has valency equal to 2 + because the electronic configuration of Mg is [2,8,2] . The nearest noble gas to magnesium is neon with electronic configuration of [2,8], to achieve this stable electronic configuration Mg can lose 2 valence electrons, hence its valency is 2 + .
Explanation: The number of electrons in Oxygen is 8. So, electronic configuration of oxygen is 2,6. It takes or accepts 2 electrons to achieve 8 electrons in its outermost shell to complete the octet and become stable .
Ans: Historically, these metals were referred to as the “basic metals” because their oxides formed basic solutions when dissolved in water and remained solid at temperatures acceptable to ancient alchemists . They are too reactive to be found in nature in their elemental form like the elements of Group 1A.
Among the group 2 elements, radium is known to have the greatest metallic character and it can, therefore, be considered the most metallic group 2 element. This is because the metallic character of elements increases while traversing down a group, and radium is at the bottom of group 2 in the modern periodic table.
Francium is an alkali metal whose chemical properties mostly resemble those of caesium . A heavy element with a single valence electron, it has the highest equivalent weight of any element.
Outermost shell of Ni is 4th shell i.e N shell. It contains 2 electrons. Therefore Ni has 2 valence electrons .
There are only two s-orbital present in beryllium and the electrons present in outermost orbit is 2 . therefore, it is the correct answer.
