[Reeta]

Can any body help..
I need these Q's' Answers.. 

1. The element of Copper is found to be contain the two isotopes 63Cu and 65Cu whose masses have been determined to be 92.9298 and 64.9278 amu respectively, calculate the average atomic mass of copper?

2. During the experiment of determine charge of electron,  the resulted charge/mass ratio was = 9.58 x 104  c/g, calculate the mass of this particles if you know that its charge was (e) = 3.2 x 10-19 coulombs.

3.What are the number of protons, neutrons, and electrons in each of the following:
 

4. Use Rydberg equation to calculate the wave length of the spectral line in hydrogen that would result when an electron drops from the Fourth Bohr orbital to the second.

5.Discuss the contribution of the following scientist towards the classification of the elements; Dobereiner, Newlands; Mandeleev.

6.Use the periodic table to writing the complete configuration of these elements: P, Ni, As, Ba, Rh. Ho, Sn

7. For the above metals give  your opinion about their, Ionic Radii, Metallic and non metallic characteristics. 

[sjb]

Can any body help..
I need these Q's' Answers..  

1. The element of Copper is found to be contain the two isotopes 63Cu and 65Cu whose masses have been determined to be 92.9298 and 64.9278 amu respectively, calculate the average atomic mass of copper?

What percentage of the atoms has mass 92.9298 (sic?) amu, and which percentage 64.9278 amu?

2. During the experiment of determine charge of electron,  the resulted charge/mass ratio was = 9.58 x 104  c/g, calculate the mass of this particles if you know that its charge was (e) = 3.2 x 10-19 coulombs.

Do you mean 9.58 x 10⁴ c / g?

3.What are the number of protons, neutrons, and electrons in each of the following:
 

¹³²₅₅Cs - what do each of the numbers mean?

4. Use Rydberg equation to calculate the wave length of the spectral line in hydrogen that would result when an electron drops from the Fourth Bohr orbital to the second.

What is the Rydberg equation?

5.Discuss the contribution of the following scientist towards the classification of the elements; Dobereiner, Newlands; Mandeleev.

Perhaps have a google or similar?

6.Use the periodic table to writing the complete configuration of these elements: P, Ni, As, Ba, Rh. Ho, Sn

For starters, what group and period are each of the listed elements in?

7. For the above metals give  your opinion about their, Ionic Radii, Metallic and non metallic characteristics.  

Well, my opinions may not be yours...

[Reeta]

What percentage of the atoms has mass 92.9298 (sic?) amu, and which percentage 64.9278 amu?

There is no percentage in the question

Do you mean 9.58 x 104 c / g?

yes   

13255Cs - what do each of the numbers mean?

132= mass No.
55= Atomic No.

What is the Rydberg equation?

91.1nm/l = [1/m2 - 1/n2]


.. Thanks for your help

[sjb]

What percentage of the atoms has mass 92.9298 (sic?) amu, and which percentage 64.9278 amu?

There is no percentage in the question

Then I'm not really sure the question can be answered

Do you mean 9.58 x 10⁴ c / g?

yes  

OK, can you manipulate the figures to get a quantity in grams?

¹³²₅₅Cs - what do each of the numbers mean?

132= mass No.
55= Atomic No.

What do mass no, and atomic no mean?

What is the Rydberg equation?

91.1nm/l = [1/m² - 1/n²]

What are m and n?

[afnan]

plz help me more i cannt do it ..

i am bad in  chemical .

[sjb]

If, say 40% of the atoms had mass 30 u each, and 60% 32 u, what would the atomic weight be?