8. Write the notation of an atom 'X', if the mass number is A and the atomic number is Z.
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What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?