3. How many valence electrons are in the outermost energy level of each of the following elements?

a. Helium

b. Lithium

c. Nitrogen

d. Magnesium

What do all group 2 elements have in common? They all gain two electrons to form a stable outer energy level. They form covalent bonds with halogens. They all react easily with the noble gases. They tend to form ionic bonds by losing electrons

The power needed to operate your body is about 100 watts. suppose a human body (of typical mass) could run on fusion power and could convert 0.6 % of its mass into energy. part a how much energy would be available through fusion?

Which of the following technologies would produce the most energy in light waves? A. Halogen lightbulb B. Radio-controlled toy airplane C. Microwave industrial drying equipment D. Ultraviolet disinfecting wand

Which type of fusion occurs in a high-mass star near the end stages of its life cycle?

The creation of carbon monoxide is an effect. What is one cause? A the regrouping of the atoms in table salt B the burning of fossil fuels C cleaning swimming pools D operating a stove

A heavy rope, 50 ft long, weighs 0.5 lb/ft and hangs over the edge of a building 120 ft high. how much work is done (in ft-lb) in pulling half the rope to the top of the building?

Does adding a neutron to an atom's nucleus makes it an ion?

What is the difference between a fault-block and upwarped mountains?

Which of the following is not one of the reasons to properly warm up before exercising? A. Develop overall flexibility. B. Increase blood flow to the muscles and raise body temperature. C. Prevent injuries such as strains sprains and muscle cramps.

you are not chilly when swimming in warm water. but when emerging from warm water on a warm summer day, you feel chilly if the wind is blowing. Explain