There are four pairs of electrons around the central carbon atom of methane. These pairs each consist of one electron originally from the carbon and one from the hydrogen atom bonded to it.
Though the question only considers the outer shell of electrons, as that is the only shell used for bonding, it may be useful to remember that in methane the carbon atom has a total of ten electrons around it, due to its two inner electrons.
The number of groups refers to the number of atoms or electron pairs that are bonded to the central atom. In methane or CH4, the carbon is attached to four atoms of hydrogen.
Four
4
For groups 1-2 the number of valence electrons is equal to the number of the group.For groups 13-18 the number of valence electrons is equal to the number of the group, but with numbering starting up from 3 (13), 4 (14) , etc. (transition metals excluded).
The atomic number from a periodic table is the number of electrons each known element has in its orbit. The atomic number of Xe is 54, therefore Xenon (Xe) has 54 electrons in its orbit.
the number of valence electrons is directly proportional to the group number in which the element is forund in the periodic table. for example, chlorine is in Group 7 so it has 7 valence electrons.
Let us get number atoms of the constituent first.4 grams CH4 (1 mole CH4/16.042 grams)(6.022 X 1023/1 mole CH4)= 1.5 X 1023 atoms of methane========================so,Carbon is one to one in the molecular formula, so let's get the number of hydrogen atoms in this mass methane.1.5 X 1023 atoms CH4 (4 mole H/1 mole CH4)= 6 X 1023 atoms hydrogen======================now, we proceed to find electrons1.5 X 1023 atoms carbon * 6 electrons= 9 X 1023 electrons carbon--------------------------------------6 X 1023 atoms hydrogen * 1 electron= 6 X 1023 electrons hydrogen--------------------------------------------added together= 1.5 X 1024 electrons in 4 grams methane-------------------------------------------------------------( call it 2 X 1024 electrons methane to be in line with significant figures )
Because groups/families determine how many valence electrons the element will have. Therefore, all the elements in a group/family have the same number of valence electrons Chemimal and Physical.
By The Number Of Prontons And Electrons...
In methane, the combined protons from the carbon and hydrogen, are equal in number to the combined amount of electrons. This gives a total net charge of 0, it is neutral.
The groups have equal number of valence electrons. The elements in same groups have same chemical properties.
Group 8
The total number of electrons in any atom is the same as the atomic number. The number of valence electrons in an atom in columns 13 - 18 is the second digit of the column number.
For Groups 1 and 2 the valence number is the group number, for groups 13-18 it is the last digit of the group number so oxygen (group 16) would have 6 valence electrons. For all the other groups ( group 3-12, the transition metals ) they are variable.
atoms in a group have the same number of valence electrons
1,2 and 13-18 the number is how many valence electrons it has.
All groups have the same number of valence electrons and hence have similar properties.
For the group 1 and 2 elements, the group number is the number of valence electrons. For groups 13 - 18, subtract 10 from the group number to get the number of valence electrons.
For groups 1-2 the number of valence electrons is equal to the number of the group.For groups 13-18 the number of valence electrons is equal to the number of the group, but with numbering starting up from 3 (13), 4 (14) , etc. (transition metals excluded).
elements in a group have the same number of valence electrons.