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lianna [129]
3 years ago
14

if an atom has 17 electrons and its mass number is 35, calculate the following: - number of protons - number of neutrons -atomic

number
Chemistry
1 answer:
djverab [1.8K]3 years ago
4 0
Electrons, Protons and the Atomic Number is the exact same. So 
Protons - 17
Atomic Number -  17

and the neutrons come by subtracting the protons from the Atomic Mass, which in this case 35. 
35-17 = 18
Neutrons = 18

Protons = 17
Atomic Number = 17
Neutrons = 18

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How many atoms are in 20.6 moles of curium
Harman [31]

Answer: 1.24 × 10^25

Explanation:

\frac{20.6 moles}{1} × \frac{6.022 * 10^{24} }{1 Mole}

Using our knowledge in unit conversions, we know the mole units cancel each other out and all there's left is the atom unit. From here we can multiply the fractions and eventually we end with the number 124.0532 × 10^23

According to the scientific notation rules, the number to the left of the decimal cannot exceed 10 so we have to move the decimal to the left two spaces. With this change, we also have to change the exponent of the 10. Because we moved the decimal point two spaces to the left, that means we have 10^25.

4 0
3 years ago
What would barium do to obtain a noble gas structure?
ExtremeBDS [4]
Ba 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s² → [Xe]6s²

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6 0
3 years ago
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If you determine the molar heat of neutralization for an acid is 49.1 kJ/mol and the accepted value is found to be 55.2 kJ/mol,
zhenek [66]

Answer: % Errror = 11.05%

Explanation:

Percentage error is the difference between the measured value and the theoretical value as expressed in percent.

That is;

% Error =

( Theoretical value -measured value) /(Theoretical value) × 100

Theoretical value =55.2kJ

Measured value = 49.1kJ

% Error = (55.2-49.1)/(55.2) ×100

%Error = 6.1/55.2 ×100

% Error = 0.1105 ×100

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Therefore the percentage error is 11.05%

5 0
3 years ago
What is the ph of a 0.15 m solution of ammonium chloride?
Thepotemich [5.8K]
 Best Answer:  <span>(a) 
8.9 x 10^-7 = x^2 / 0.15-x 
x = [OH-] = 0.00037 M 
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(b) 
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7 0
3 years ago
The hall reaction of an oxidation-reduction reaction shows that iron gains electrons. What does this electron gain mean for iron
AnnZ [28]

Answer: Iron gains electrons mean It is reduced

Explanation:

Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

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Thus iron gains electrons mean It is reduced

6 0
3 years ago
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