1. Which of the following statements about substomic particles is TRUED A) Electrons make up most of the mass of an atom. B) Neutrons and electrons are found in the nucleus of an adorts C) Protons and neutrons have opposite , but equal in magnitude,charges D) A neutral atom contains the same number of protons and electrons E) Protons have about the same mass as electrons 2. Which of the following elements is a gas at room temperature? D) orygen A) barium B) sodium C)bromine 3. Which element has the chemical symbol.. Rn? C) radon D) radium A) thenium B) rhodium 4. What answer should be reported.with the correct number of significant figures, for the f calculation? (433.621-333.9)times 11.900 A) 1.187times 103 B) 1.18680times 103 C) 1.1868times 103 D 119times 103 B) 1. 5. What is the mass of an object that has a volume of 88.6cm^3 and a density of 2.21 g A) 197 g E) 90.82 g B) 86.4 g C) 39.9 g (D) 0.0251 g 6. The mass of a single arsenic atom is 1.244times 10^-22 9. This is the same mass as 1244times 10 A) 1.244times 10^-25kg B) 1.244times 10^-31ng D) 1.244times 10^-28mu g 1.244times 10^-18Mgg 7. Gallium is a solid metal at room temperature, but it will melt to a liquid in your ha point of gallium is 85.6^circ F . What is this temperature on the Celsius scale? E 709^circ A) 29.8^circ C B) 40.5^circ C C) 52.8^circ C D) 60.7^circ C E) rubidiu

1. The correct answer is D) A neutral atom contains the same number of protons and electrons. This is because the positive charge of the protons is balanced by the negative charge of the electrons, resulting in a neutral overall charge for the atom.<br /><br />2. The correct answer is D) Oxygen. Oxygen is a gas at room temperature, while barium, sodium, and bromine are all solids.<br /><br />3. The correct answer is C) Radon. The chemical symbol "Rn" represents radon, not thenium, rhodium, or radium.<br /><br />4. The correct answer is A) $1.187\times 10^{3}$. The calculation $(433.621-333.9)\times 11.900$ should be reported with the correct number of significant figures, which is 4 in this case. The result of the calculation is approximately 1.187, so the answer should be reported as $1.187\times 10^{3}$ to maintain the correct number of significant figures.<br /><br />5. The correct answer is A) 197 g. The mass of an object can be calculated using the formula mass = density x volume. In this case, the volume is $88.6 cm^{3}$ and the density is 222 g/$cm^{3}$. Multiplying these values gives a mass of 197 g.<br /><br />6. The correct answer is D) $1.244\times 10^{-28}\mu g$. The mass of a single arsenic atom is given as $1.244\times 10^{-22}$ g. To convert this mass to (µg), we need to multiply by $10^{6}$ (since 1 g = $10^{6}$ µg). Therefore, the mass of a single arsenic atom in micrograms is $1.244\times 10^{-22}$ g x $10^{6}$ = $1.244\times 10^{-28}\mu g$.<br /><br />7. The correct answer is A) $29.8^{\circ }C$. To convert the temperature from Fahrenheit to Celsius, we can use the formula Celsius = (Fahrenheit - 32) x 5/9. Plugging in the given temperature of $85.6^{\circ }F$, we get Celsius = (85.6 - 32) x 5/9 = 29.8°C.