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muminat
3 years ago
15

An element's atomic number is 86. how many protons would an atom of this element have?

Chemistry
1 answer:
rusak2 [61]3 years ago
8 0
The number of protons an element has is the same as the atomic number, so the element would have 86 protons.
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On the periodic table, calcium and bromine are located in period 4. What is one difference between the two elements?
Dovator [93]

Answer:

D

Explanation:

Just look at the groups and their tendencies. Or look at their electron configurations. You will notice that calcium has 2 valence electrons and bromine has 7 valence electrons.

Halogens have the most valence electrons possible without completing a shell (8 would be needed for that)

4 0
3 years ago
EL hidroxido de sodio reacciona con el sulfato de hierro (II) para formar sulfato de sdio e hidroxido ferroso. Si se hace reacci
Oduvanchick [21]

Answer:

280.8 g

Explanation:

Definimos la reaccion:

2NaOH +  FeSO₄  →  Na₂SO₄  +  Fe(OH)₂

Como tenemos la masa de NaOH, asumimos que el sulfato de hierro (II) es el reactivo en exceso.

Definimos masa de reactivo: 250 g . 1mol / 40g = 6.25 mol

2 moles de NaOH producen 1 mol de hidroxido ferroso

Entonces 6.25 moles producirán, la mitad (6.25  . 1) /2 = 3.125 moles

Convertimos los moles a masa:

3.125 mol . 89.85 g/mol = 280.8 g

7 0
3 years ago
In which of these situations is convection most likely the main form of heat transfer?
lorasvet [3.4K]
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In the case of the metal pan the mechanism of heat transfer is conduction.

In the case of sunburn the mechanism is radiation.

In the case of an ice cube melting in a hand, conduction is the most important mechanism.
5 0
3 years ago
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(True or false) The blood carries hormones to target tissues around the body so the hormones can control the activity of those c
AlladinOne [14]

Answer:

True

Explanation:

8 0
2 years ago
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What is N3I8 chemical compound name?
joja [24]

Answer:

When naming molecular compounds prefixes are used to dictate the number of a given element present in the compound. ” mono-” indicates one, “di-” indicates two, “tri-” is three, “tetra-” is four, “penta-” is five, and “hexa-” is six, “hepta-” is seven, “octo-” is eight, “nona-” is nine, and “deca” is ten.

Explanation:

8 0
3 years ago
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