Fill in the numbers to interpret the isotope symbols.

86Rn^222 has

__ protons,

__ neutrons,

__ electrons.

Which statement describes the periodic law? Metals are both good conductors of heat and electricity. Atomic masses always increase across a period. Nonmetals are of the most reactive elements.

What two substances are indicated by the cobalt chloride and limewater tests?

Give the number of significant figures in this number: 2.110

To find the mass defect for uranium-238 several calculations must be made. which is the calculation that should be made first? assume atomic number for uranium-238 is 92. 92 (1.0073) x 92 (1.0087) = 92 (1.0073) x 146 (1.0087) = 146 (1.0073) x 238 (1.

What can you conclude about these two reactions based on the chemical equations? Reaction A: 6CO2 (g) + 6H2O (l) + sunlight → C6H12O6 (aq) + 6O2 (g) Reaction B: 2H2 (g) + O2 (g) → 2H2O (g) + energy

Which of the following is not a projectile? a. a satellite b. a throw ball c. a ball on the ground d. a soaring arrow

A change of state requires the addition or removal of heat energy. True False

Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars.

How long does a hydrogen bond last in water

If the body temperature of a person is recorded as 37°c, what is the person's body temperature in k? round your answer to the nearest whole number.