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salantis [7]
2 years ago
9

The structure of an atom is defined by two numbers: the proton (atomic) number and the mass (nucleon) number. What is the electr

onic configuration of an atom with proton number 5 and mass number 11?
A 2,8,1
B 3,2
C 2,3
D 1,8,2​
Chemistry
1 answer:
zzz [600]2 years ago
3 0

Answer:

c

Explanation:

electronic configuration of  an atom with proton number 5 is 2, 3

since no. of proton = no. of electron

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Its very simple .

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The production of iron and carbon dioxide from iron(iii) oxide and carbon monoxide is an exothermic reaction. which expression c
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Missing question:
A. [3.40 mol Fe2O3 (s) × 26.3 kJ/1 mol Fe2O3 (s)] / 2 
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8 0
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Rufina [12.5K]

Answer:

d is the answer of this question

7 0
2 years ago
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4. DBearded waste of Co-60 must be stored until it is no longer radioactive. Cobalt-60
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464 g radioisotope was present when the sample was put in storage

<h3>Further explanation</h3>

Given

Sample waste of Co-60 = 14.5 g

26.5 years in storage

Required

Initial sample

Solution

General formulas used in decay:  

\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}

t = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

Half-life of Co-60 = 5.3 years

Input the value :

\tt 14.5=No.\dfrac{1}{2}^{26.5/5.3}\\\\14.5=No.\dfrac{1}{2}^5\\\\No=\boxed{\bold{464~g}}

8 0
2 years ago
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