The number of pretons in an atom is that element's
6.
the mber of protons and neutrons in an atom is that tem's
member
7
the abity of mater o to be drown into a thin wire is called
b.
the bality of material to be pounded into thin sheets is called
9
the elements in groups 3 through 12 are called the
10 the elements in group are called the
the elements in group 2 ere called the
12. the elemente ngros 18 are called the
the element group 17 ere talled the
are the most reactive metals.
ere the most reactive nonmetals
are very unreactive
react very violently with water

Explanation:

Los átomos están formados por un núcleo (formado por protones y neutrones), de tamaño reducido y cargado positivamente, rodeado por una nube de electrones, que se encuentran en la corteza.

El número de protones que existen en el núcleo, es igual al número de electrones que lo rodean. Este número es un entero, que se denomina número atómico y se designa por la letra, "Z".

La suma del número de protones y neutrones en el núcleo se denomina número másico del átomo y se designa por la letra, "A"

i think it is true since you can test the answer and can use observations to complete it.

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