Electrically neutral atoms of the same element must

A. contain the same number of neutrons

B. have the same mass number

C. contain the same number of protons

D. have equal numbers of protons and neutrons

Which substance is liquid at 0°C? 1. alcohol 2. aluminum 3. ammonia 4. copper

What happens when you change the composition of a mixture and a compound

What did the Curies conclude about radioactivity based on their studies? The amount of radioactivity is an extensive property because it varies as the amount of material varies.

Ionic bonds are formed between metals and non-metals to form salts. a. True b. False

How do tidal power generate electricity? A. A barrage holds back water during high. The force of the water against the barrage turns the plant's turbines. B.

A sample of pure copper has a mass of 5 grams calculate its volume

Which statement best explains why carbon is present in so many kinds of molecules? Question 1 options: It is abundant on earth, so it is readily available to bond with other elements. It does not form strong bonds, so it breaks apart.

How long does it tae for bleach to evaprate?

What product (s) forms at the cathode in the electrolysis of an aqueous solution of k2so4?

What element is used as a shield to protect people from radioactive substances?