, 24.01.2020ashkids7178

# The element copper has two stable isotopes, copper-63 with a mass of 62.93 amu and copper-65 with a mass of 64.93 amu. from the atomic weight of cu = 63.54 one can conclude that: - both isotopes have the same percent natural abundance - copper-65 has the highest percent natural abundance - most copper atoms have an atomic mass of 63.54 - copper-63 has the highest percent natural abundance

A. Most alkali earth metals react with cold water.

Explanation;Alkali metals react vigorously with water. Starting from sodium, they react explosively to water, as hydrogen gas is produced in the process. The reactivity even increases down the group. The alkali metals basically react with water to form metal hydroxide and hydrogen gas.All the alkaline earth metals except beryllium also react with water to form strongly alkaline hydroxides.

Uhhh

Wdym by all of that...

*Most alkali earth metals react with hot water.

I took the test and got it right!

Explanation:

Explanation:

Can I have brainliest if I'm right?

F

Explanation:

Explanation:

def getMaximumScore(array, n):

"""

array: list of positive numbers/integers

n : size of array

return: score (maximum)

"""

score=0  # initially zero

operation = "Odd"

while len(array)!=0:

s = sum(array)

if operation=="Odd":

score+=s

operation="Even"

del(array[-1])

elif operation=="Even":

score-=s

operation="Odd"

del(array[0])

return score

print("Maximum score: "+str(getMaximumScore([3,6,8],3)))

B. Fluorine

Explanation:

Nonmetallic character increases from bottom to top in a Group and from left to right in a period (see image).

Thus, the most nonmetallic elements are at the upper right corner of the Periodic Table.

We ignore the noble gases, because they are quite unreactive.

So, the element that most “wants” an electron is fluorine.

# include<iostream>

# include<stdio.h>

# include<stdlib.h>

using namespace::std;

int main()

{

int *a=NULL;

int n; int score=0;

cout<<"Enter the value of N";

cin>>n;

a=new int[n];

cout<<"Enter the elements of a";

for(int i=0;i<=n;i++)

{

cin>>a[i];

}

int num=n;int k=n;int j=num;

while(j>=num)

{

if(n%2==0)

{

for(int i=0;i<=k;i++)

{

score+=a[i];cout<<score;      }

if(a[0]>a[n])

{

a[n]=0;

n--;

}

else if(a[0]<a[n])

{

a[0]=0;

n--;

}

else if(n==1)

{

exit(0);

}

}

else

{

for(int i=0;i<=n;i++)

{

score-=a[i];

}

if(a[0]>a[n])

{

a[n]=0;

n--;

}

else if(a[0]<a[n])

{

a[0]==0;

n--;

}

else

{

exit(0);

}

}

j--;

}

cout<<"score"<<score;

return 0;

}

Explanation:

The array above is created dynamically, and rest is as mentioned in question.

The Cu-63 isotope has the highest percent natural abundance

Explanation:

Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

We are given:

Two isotopes of Copper, which are Cu-63 and Cu-65

Average atomic mass of copper = 63.54 amu

As, the average atomic mass of copper is closer to the mass of Cu-63 isotope. This means that the relative abundance of this isotope is the highest as compared to the other isotope.

Percentage abundance of Cu-63 isotope = 69.2%

Percentage abundance of Cu-65 isotope = 30.8 %

Hence, the Cu-63 isotope has the highest percent natural abundance

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