Why just indirect evidence be used to study the structure of atoms?

The charges for four ions are sodium (Na) + 1, calcium (Ca) + 2, fluorine (F) - 1, and sulfur (S) - 2. Which would be an ionic bond that could form from any of these ions? NaCa2 Na2S CaF FS

a boat traveling at a speed of 1.63 m / s has a kinetic energy of 52000 J what is the mass of the boat

If the volumes of the two rocks are equal the rock with the greater density has what

For each description, choose the fault it describes. Fault types may be used more than once. A. Strike-Slip fault B. Reverse Fault C.

When a liquid is heat but not boiling there is an increase in potential energy, kinetic energy, or all of the above

What is the frequency of 20 mm microwaves? A) 100 MHz B) 400 MHz C) 15 GHz D) 73 GHz E) 98 GHz

A measure of how much pulling, or tension, a material can withstand before breaking is - A. hardness. B. brittleness. C. tensile strength. D. malleability.

How work done against gravity can be expressed?

An electron is acted on by two electric forces, one of 2.7*10-14 N acting upward and a second of 5.8*10-14 N acting to the right. What is the magnitude of the electric field at the electron's location?

A satellite on a Low Earth Orbit is flying with a speed of 7.65 km/s. The vertical component of the Earth's magnetic field is 35.3 μT at the current location of the satellite.