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NeX [460]
3 years ago
13

3) Which subatomic particle is NOT found at the center of the atom?

Chemistry
1 answer:
erik [133]3 years ago
3 0

Answer:

electrons

Explanation:

protons and neutrons are found in the nucleus while electrons circle around the nucleus

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How many moles are in 155 grams of aluminum
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Answer:

wads

Explanation:

wadsdw

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3 years ago
When Mendeleev started his work on organizing the elements, about how many had
Talja [164]

Answer:

About 60.

Explanation:

Mendeleev knew of 63 elements. He wrote their properties on cards and arranged them in order of atomic mass.

That's how he discovered that the properties of elements are periodic functions of their atomic masses.

8 0
3 years ago
Complete and balance the following neutralization reaction Ca(OH)2 + H2SO4
Debora [2.8K]

Answer: Ca(OH)2 (aq) + H2SO4 (aq) ---------->  CaSO4(aq) + 2H2O(l)

Explanation:

Since this is a neutralization reaction, the end product would be salt and water. In this equation Calcium will displace hydrogen from the acid because it is more reactive, resulting in the formation of CaSO4 (salt), while the displaced H2 molecule combines with OH molecules to form water.

The equation of the reaction is thus;

Ca(OH)2 (aq) + H2SO4 (aq) ---------->  CaSO4(aq) + H2O(l), in other to balance it, we add ''2'' to the water molecule in the right hand side of the equation.

Balance equation is  

Ca(OH)2 (aq) + H2SO4 (aq) ---------->  CaSO4(aq) + 2H2O(l)

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Sodium (Na) has 11 protons and 12 neutrons. What is its isotope notation?
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When 50,0 g of silicon dioxide is heated with an excess of carbon, 32.2 g of
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