Answer:
Tellurium
Explanation:
Technetium's position on the periodic table is 43 and Tellurium's is 52
Answer:
76
Explanation:
Alpha decay is one of the most basic forms of radioactive decay. It has an atomic mass of 4 and a proton number of two.
Undergoing an alpha decay will decrease the atomic mass by four and the atomic number by two.
In this particular question, we are particular about the atomic number. The atom has an atomic number of 78. So taking 2 off this gives 76
<span>For the answer to the question above, we have to use this formula
moles equal mass divided by the molar mass
a) 4.50 g divided by the molar mass of water
molar mass of water = 2x1.0 + 1x16.0 = 18
4.50 g / 18.0 g per mole = 0.25 moles
b) 471.6 g / Molar mass of Ba(OH)2 = moles
c) 129.68 g / molar mass of Fe3(PO4)2 = moles
atoms of P in Mg3(PO4)2
2 atoms of P in each molecule of Mg3(PO4)2
247 g / molar mass of Mg3(PO4)2 = moles
moles of Mg3(PO4)2 x 6.022x10^23 = molecules of Mg3(PO4)2
I hope my answers gave you clarity on your question.</span><span>
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Explanation:
hope it make sense to u :)