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Black_prince [1.1K]
4 years ago
4

Es un micronutriente para todas las formas de vida conocidas que se encuentra en el pan, los cereales, el pescado, las carnes, l

as lentejas, la cáscara de las patatas y los huevos. Determine el número de electrones de valencia de un átomo que presenta número de masa 80 y posee 46 neutrones. Además indique a que grupo y periodo pertenece dicho

Chemistry
1 answer:
Ivan4 years ago
6 0

Answer:

Six valence electrons; selenium; Group 16, Period 4

Explanation:

Mass number = no. of protons + no. of neutrons

M =  p +  n

80 =  p + 46

 p =34

An atom with 46 neutrons and a mass number of 80 has 34 protons.

The element with 34 protons is selenium, Se.

It is in Group 16 and Period 4.

The element is in Group 16, so it has six valence electrons.

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