Which of the following pairs of elements would have the most similar properties? A. Hydrogen (H) and Helium (He) because they are both gasses

B. Sodium (Na) and Potassium (K) because they have similar reactivity

C. Antimony (Sb) and Silicon (Si) because they are both metalloids

D. Aluminum (Al) and Magnesium (Mg) because they are both silver

Where can i find naap lab answers sheet/key?

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth

Imagine if during the cathode ray experiment, the size of the particles of the ray was the same as the size of the atom forming the cathode. which other model or scientific observation would have also been supported? 1. this would support dalton's postulates that proposed the atoms are indivisible because no small particles are involved. 2. this would support bohr's prediction about electrons moving in orbits having specific energy. 3. this would support bohr's prediction about electrons being randomly scattered around the nucleus in the atom. 4. this would support dalton's postulates that proposed that atoms combine in fixed whole number ratios to form compounds.