The Correct choice is~ B
The elements shown in green boxes are ~ <u>Metalloids</u>
your answer is Option B
there are 90 elements found naturally so option B statement is incorrect
HOPE THIS WILL HELP YOU
Answer:
x y
A and A, where x and y are the mass b b numbers, b is the atomic
and A is the chemical symbol of the element
They are different because they have different mass numbers and are similar because they have the same atomic number
Explanation:
Isotopes are atoms that have the same atomic number but different mass numbers due to the difference in neutron number.
Answer:
Formula of EPSOM salt = MgSO4.7H2O
molecular mass of MgSO4.7H2O = atomic mass of Mg + atomic mass of S + 4 × atomic mass of O + 7 { 2 × atomic mass of H + atomic mass of O }
= 24 + 32 + 4× 16 + 7{ 2 × 1 + 16 } g/mol
= (24 + 32 + 64+ 126 ) g/mol
= 246 g/mol
molecular mass of total water = 7 × ( 2× atomic mass of H + atomic mass of O )
= 7 × 18 = 126 g/mol
now ,
% mass of H2O in EPSOM salt = {total molar mass of H2O/molar mass of Epsom salts }× 100
= {126/246 } × 100
= 12600/246
= 51.21 %
Explanation:
i have done it hope it helps
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