Atoms of which element have two protons and two electrons?

a. Carbon

b. Helium

c. Hydrogen

d. Lithium

Which metallic properties are caused by atoms rolling over each other in metallic bonds? a. malleability and ductility b. shininess and ductility c. conductivity, malleability, and shininess d. ductility, conductivity, and malleability

The annoying sound from a mosquito is produced when it beats its wings at the average rate of 600 wingbeats per second. What is the frequency of the soundwaves?

Why is sea-floor spreading and deep-ocean trenches similar?

What is dispersion, and how is it related to diffraction and refraction?

A caterpillar climbs up a one-meter wall. For every 2 cm it climbs up, it slides down 1 cm. It takes 10 minutes for the caterpillar to climb to the top. Calculate the speed at which the caterpillar travels in cm/s.

Which of the following is evidence used to support the Big Bang Theory? background radiation increasing distances between galaxies both of the above

Which of the following statements about noncovalent bonding interactions is NOT true? Van der Waals interactions, also known as dispersion forces, are the weakest of the attractive noncovalent bonding interactions.

Does a rising GDP benefit everyone

You have a neutral balloon. What is its charge after 12000 electrons have been removed from it? The elemental charge is 1.6 * 10-19 C. Answer in units of µC.

Which formula can be used to find the x-component of the resultant vector?