Elemento Símbolo A qué grupo pertenece A qué periodo pertenece N° de niveles de energía N° de protones y electrones que tiene el elemento químico Potasio
Azufre
Oxigeno
Bromo
Polonio
Francio
Estroncio
Neón
Hidrogeno
Calcio
Cloro
Yodo
Aluminio

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

12 is it do you think so

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.