Does the atom bromine (Br) contains 35 valence electrons?

Question

Just wondering if I figured this out right...Potassium (K) contains 19 valence electrons and Bromine (Br) contains 35, Oxygen (O) conains 8 and Carbon (C) would then contains 6..am I completely wrong? If I am could someone correct me? Thanks!

Answer 1

Yes, sorry you are completely wrong. Valence electrons are the electrons in the outer energy level, not the whole atom.
Bromine has 35 total electrons , but only 7 valence electrons
Potassium has 1 valence electron
Oxygen has 6
Carbon has 4

For the group A elements, take the last number of the group number to find the valence electrons. For example, Boron is in group 13, so it has 3, Calcium is in group 2, so it has 2, etc.

Answer 2

An easy way to find out how many valence electron a given element has (ok, let's forget about the transition metals) is to just look at a periodic table. The group number the element is located in represents the number of valence electrons. A more scientific answer would be that the electron configuation for bromine is 1s2 2s2p6 3s2p6d10 4s2p5 Shells 1, 2 and 3 are all filled, shell 4 has 7 electrons (2 in the 4s-orbital, 5 in the 4p-orbital), hence, bromine has 7 valence electrons.

Answer 3

Valane electrons are those electrons at the outer "edge" or highest energy level of an atom's electron cloud. You can tell the number of valance electrons by looking at the electron configuration of the atom. For example OXYGEN has an electron configuration of 1s2 2s2 2p4. It has a total of 6 electrons in 2nd energy level (principle quantum number, n=2) Add the 2 s electrons at this second energy level with the 4 p electrons at this energy level and you get 6 total valance (outer energy level) electrons.

Potassium would have 1 valance electron (4s1), Bromine would have 7 (4s2 3d10 4p5) The HIGHEST energy level electrons are the 2 electrons in the 4s orbital and the 5 electrons in the 4p orbital, Add 2+5 you get a total of 7 valance electrons.

Easy to think of it this way. The s and p orbitals will be the ones involved in bonding - if you look at your periodic table and look at the representative elements (groups 1&2, 13-18), all the elements in group 1 will have one valance electron, group 2 will have 2, group 13 will have 3, group 4 will have 4.... etc. group 18 will have 8 (an octet) the energy level is full, hence the reason the nobel gases are unreactive - their orbitals are full and have no reason to gain or lose or share electrons with any other atom. Hope that this helps!

Answer 4

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RE:
Does the atom bromine (Br) contains 35 valence electrons?
Just wondering if I figured this out right...Potassium (K) contains 19 valence electrons and Bromine (Br) contains 35, Oxygen (O) conains 8 and Carbon (C) would then contains 6..am I completely wrong? If I am could someone correct me? Thanks!

Answer 5

Completely wrong.

Valence electrons are those in the outer shell. That's where the bonding takes place.

Bromine has 7 valence electrons (as do all of the halogen group of elements)

Answer 6

Wrong! The valence electrons are the ones in the outermost shell (the last energy level), as most of the others have said. Br has 7, O has 6, C has 4, and K has 1.

Answer 7

You are misunderstanding the concept of VALENCE electrons...

The valence electrons are those in the OUTER SHELL. Bromide ion thus has only seven. Carbon has 4. Oxygen, 6.
And so forth.

As a hint, look at the family it falls in. The coefficient of the group number is the same as the number of valence electrons.
Carbon is in Group IV - has 4 valence electrons.

Answer 8

yes, you are wrong. you are looking at the atomic number of these elements. for valence electrons, you need to look above the groups, vertical columns, in which the element is located, and find the roman numberal. that tells you how many valence electrons.

so, oxygen would have 6, bromine would have 7.

Answer 9

Yes you are wrong i agree with what the others said....yup thats it.