Answer :
Answer:
Xe : core electrons = 46
Xe : valence electrons = 8
Ca : core electrons = 18
Ca : valence electrons =2
Br : core electrons = 28
Br : valence electrons = 7
Explanation:
- Xe atom has atomic number 54, as a group 8 element, it has a valence (outermost) electrons of 7 meaning the rest of 46 electrons are core (inner) electrons.
- Ca atom is in group 2 in the periodic table. Having 20 electrons, two electrons are on the valence shell while the rest 18 are cor electrons.
- bromine is a halogene (group 7) and hence 7 valence electrons. it has 35 electrons. it has 28 core electrons.
Final answer:
Xenon (Xe) has 46 core and 8 valence electrons, Calcium (Ca) has 18 core electrons and 2 valence electrons, and Bromine (Br) has 28 core and 7 valence electrons. Valence electrons are the ones that are involved in bonding and are usually found in outermost shell, while core electrons occupy the inner shells of an atom.
Explanation:
The concept of core and valence electrons is crucial in chemistry, especially in understanding chemical bonding and atom interactions. You have asked for the number of these electrons in Xenon (Xe), Calcium (Ca), and Bromine (Br).
For Xe, it includes 54 electrons in total. Among them, 46 are core electrons while 8 are valence electrons.
Calcium (Ca), which is a group 2 element, has a total of 20 electrons. Out of these, 18 are core electrons and 2 are valence electrons.
Lastly, Bromine (Br) contains 35 electrons, with 28 being core electrons and 7 as valence electrons.
Remember, valence electrons are the ones that are involved in bonding and are usually found in the outermost shell of an atom, while core electrons occupy the inner shells.
Learn more about Core and Valence Electrons here:
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