Mara and Ivy are asked to identify two minerals in science class. To do this, they decide to study the physical properties of the minerals in the following ways. 1. Examine how they freeze.
2. Determine how they break.
3. Rub them on a white tile plate. What is the best method (or methods) for the girls to study the physical properties and
identity the two minerals?
1 only
2 only
1 and 2
2 and 3

 determine how they break

Explanation:

hope this helps!

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements