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What is a group of elements that rarely combine with other elements because they already have eight electrons in their outer shells?
A group of elements that rarely combine with other elements because they already have eight electrons in the outer shells is a Noble Gas
Do noble gases have valence shells?
Yes they have eight electrons in their valence shells. This is why they are not reactive. All elements have valence shells.
What is different in number of shells in magnesium and sulphur?
There are no difference in the number of shells in magnesium and sulphur. Both elements contain 3 shells. However, the total number of electrons in the shells are different. Magnesium has 12 electrons in its shells whereas sulphur has 16 electrons in its shell. In addition, the electrons in the valence shell (outermost shell) are also different. Magnesium has 2 electrons in its valence shell whereas sulphur has 6 electrons in its valence shell.
Elements with complete outer shells?
Elements with complete outer shells have a full valence shell of electrons and are stable. This configuration is typically achieved by having eight electrons in the outer shell (known as the octet rule) or two electrons for the first shell. These elements are generally inert or have low reactivity due to their stable electron configuration.
What does the group of the periodic have to do with reactivity?
The table was organized so that elements of similar properties are in the same group. What (partly) determines reactivity is the number of electrons an atom has in it's ground state. . Within the atom electrons are organized in shells. Atoms are stable when they have 8 electrons in their outer shell (for hydrogen and helium it is 2 electrons.) . Elements of: Group 18 have 8 electrons in their outer shells Group 17 have 7 electrons in their outer shells Group 16 have 6 electrons in their outer shells Group 15 have 5 electrons in their outer shells Group 14 have 4 electrons in their outer shells Group 13 have 3 electrons in their outer shells Groups 3-12 have varied number of electrons in their outer shells Group 2 have 2 electrons in their outer shells Group 1 have 1 electron in their outer shells
Does the periodic table explain the shell model or does the shell model explain the periodic table?
The shell model explains the organization of the periodic table. The elements in the first period have electrons in the first shell; the elements in the second period have electrons in the first two shells; the elements in the third period have electrons in the first three shells; and so on.
Why does the size of the elements increase down a group?
The atomic numbers of the elements down a group increase. this means, more electrons. More electrons mean more shells. More shells mean larger radius. Larger radius is nothing but larger size. Thus, the number of electrons or shells is the reason why the size of the atom of elements increase down the group.
As you move across a period elements have the same number of?
As you move across a period, elements have the same number of electron shells but different numbers of valence electrons. This leads to differences in reactivity and chemical properties across the period.
Which elements can lose electrons from the two outermost shells?
Elements in Groups 1 and 2 (alkali metals and alkaline earth metals) can easily lose electrons from their outermost shells. Group 13 elements like Boron, as well as Group 17 elements like Halogens, can also lose or gain electrons from their two outermost shells, though the valency may vary.
What elements total number of electrons is equal to the number of core electrons in chlorine?
Chlorine has 17 electrons in total. Of these, 10 are core electrons, which are the electrons in the inner shells (1s² 2s² 2p⁶). The elements that also have 10 electrons in their core configuration are neon (Ne) and argon (Ar), as they both have a similar electron configuration in their inner shells.
What is the number of unpaired electrons elements in noble gas?
There are no unpaired electrons. All electron shells are filled; this is the reason they are called the noble gases.
How does the number of valence electrons affect an element?
The number of valence electrons determines an element's reactivity and ability to form chemical bonds. Elements with a full valence shell are stable and less likely to react, while elements with incomplete valence shells are more reactive and tend to form bonds to achieve stability.
