Which of the following best explains why diamonds are very hard? a. diamonds are made up of several different isotopes of carbon. b. diamonds are made up of several different allotropes of carbon. c. the atoms in a diamond are arranged in a rigid crystalline structure. d. the atoms in a diamond are arranged in flat sheets that are tightly bonded.

100mg magnesium reacts with 20ml of 1.0m hcl

Remember to use the proper number of significant figures and leading zeros in all calculations.gelatin has a density of 1.27 g/cm³. if you have a blob of gelatin dessert that fills a 2.0 liter bottle, what is its mass? 2540 g2500 g3.9 x 10-43.937x 10-4

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.