Respuesta :
1.) Oxygen, O :
Atomic number = 8
Inner electrons = 2
Outer and valence electrons = 8 - 2 = 6
2.) Strontium, Sn :
Atomic number = 38
Inner electrons = 2
Outer and valence electrons = 38 - 2 = 36
3.) Calcium, Ca :
Atomic number = 20
Inner electrons = 18
Outer and valence electrons = 20 - 18 = 2
4.) Iron, Fe :
Atomic number = 26
Inner electrons = 26 - 8
Outer and valence electrons = 8 - 2 = 6
5.) Selenium, Se :
Atomic number = 34
Inner electrons = 34 - 6 = 28
Outer and valence electrons = 34 - 6 = 28
What are valence electrons?
- A valence electron is an electron that is part of an atom's outer shell in chemistry and physics.
- If the outer shell is open, the valence electron can take part in the formation of a chemical bond.
- Each atom in the bond contributes one valence electron to create a shared pair in a single covalent bond.
- The chemical properties of an element, such as its valence—whether it can connect with other elements and, if so, how quickly and with how many—may be affected by the existence of valence electrons.
How are the valence electrons located?
- The number of valence electrons is represented by the group number's one digit.
- To solve without a periodic table, identify the element's electron configuration and divide the electrons into two groups of two, then eight shells.
- The quantity of valence electrons is indicated by the number in the last group.
Learn more about valence electrons here:
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