Which statement correctly compares the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca)? (1 point)

Rubidium has more protons and fewer electrons than calcium.

Rubidium has fewer protons and more electrons than calcium.

Rubidium has more protons and more electrons than calcium.

Rubidium has fewer protons and fewer electrons than calcium.

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .

Ablock of aluminum is dropped into a graduated cylinder with an initial volume of water at 75ml and the volumes rises to 90ml. if the block has a mass of 40.5 g what is its density ?

How many joules of heat are required to raise thetemperature of 750 g of water from 11.0 °c to 19.0 °c?