Es para completar un crucigrama besties PISTAS:
1- MANERA DE COMBINAR LOS ATOMOS PARA FORMAR MOLECULAS.
2- PARTICULAS DEL ATOMO QUE POSEEN MASA, PERO NO CARGA.
3- EXCEPCIÓN DE LA REGLA DEL OCTETO.
4- ELEMENTOS QUE MAS ABUNDAN EN LA TABLA PERIODICA.
5- UNION EN LA QUE UN ATOMO LE DA ELECTRONES A OTRO.
6- REGLA QUE SE BASA EN QUE LOS ATOMOS SE ESTABILIZAN COMPARTIENDO O
CEDIENDO ELECTRONES.
7- PARTICULA PEQUEÑA, QUE CONSTA DE DOS ZONAS

answer seismograph;

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.