Copper exists in nature as two isotopes. the atomic masses and relative abundance of these isotopes is given in the table. what is the average atomic
mass of copper?
relative abundance(%)
atom
isotope
cu-63
cu-65
163
to
69 17
mass (amu)
62.93
64.94
30.81
30.83
a. 62.93 amu
b. 63.55 amu
c. 63.935 amu
d.
64.94 amu
e
127 87 amu
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Option B) 63.55 amu

Explanation:To find the average atomic weight of the two isotopes of copper that exist in nature we can use the below formula;

Average atomic mass = ∑ (isotope(s) x abundance)

Therefore, we have the given values of atomic masses of two copper isotopes are 62.93 u and 64.93 u, respectively. They have natural abundance as 0.692 and 0.368, respectively,

On substituting the above values, we get,

Average atomic mass = (62.93 x 0.692) isotope 1 of Cu + (64.93 x 0.308) isotope 2 of Cu

Average atomic mass = 43.54 + 19.99 = 63.538 ~ 63.55

Therefore, the average atomic mass of Cu will be 63.55 amu.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

the answer is c i took the test