Week 2 Chemistry Quiz

The atomic number of an element corresponds to the number of protons in its nucleus. Since the number of protons and electrons in a neutral atom are equal, the atomic number also tells us the number of electrons in the element. Therefore, the correct answer is protons, electrons, and protons and electrons.

A proton is a subatomic particle that carries a positive charge. It is one of the fundamental particles that make up an atom, along with neutrons and electrons. Protons are located in the nucleus of an atom and are essential for determining the atomic number and identity of an element. They have a charge of +1, which is equal in magnitude but opposite in sign to the charge of an electron. Therefore, the correct answer is positive.

An electron is a subatomic particle that carries a negative charge. It is one of the fundamental particles that make up atoms. Electrons are found outside the nucleus of an atom and are involved in various chemical reactions and electrical currents. The negative charge of an electron is equal in magnitude to the positive charge of a proton, which is the other subatomic particle found in the nucleus of an atom. Therefore, the correct answer is negative.

A neutron is a subatomic particle that is found in the nucleus of an atom. It does not have any electrical charge, meaning it is neutral. Unlike protons, which have a positive charge, and electrons, which have a negative charge, neutrons have no charge at all. This neutrality allows neutrons to interact with both positively charged protons and negatively charged electrons, contributing to the stability of an atom.

The value 12.0cm would be closer to the actual length of the object. The additional decimal place in 12.00cm does not provide any significant increase in accuracy since the object's length is given to the nearest tenth of a centimeter. Therefore, the extra zero after the decimal point in 12.00cm is irrelevant in this context.