Which of these statements is incorrect regarding an atom of the element scandium?
a. its chemical symbol is sc.
b. it has 21 positively charged protons in its nucleus.
c. it has 21 negatively charged electrons.
d. it has 21 neutrons in its nucleus.

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg