Advertisements
Advertisements
Question
Explain fractional atomic mass. What is the fractional mass of chlorine?
Advertisements
Solution
Atomic masses of the isotopes of chlorine are 35 and 37. However, in any given sample of chlorine gas, the isotopes occur in the approximate ratio 3:1, 75% of Cl35 and 25% of Cl37. So, the relative atomic mass or atomic weight of chlorine is 35.5.
Fractional atomic mass of chlorine
At. Mass = `(3(35) + 1(37))/2 = (105 + 37)/2`
APPEARS IN
RELATED QUESTIONS
Mention the basic tendency of an atom which makes it to combine with other atoms.
What type of bond is formed between two atoms, when the electronegative difference between them is zero?
Element X is a metal with a valency 2; Y is a non-metal with a valency 3.
(a) Write an equation to show how Y forms as ion
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
How does the Modern atomic theory contradict and correlate with Dalton's atomic theory?
State the type of bonding in the following molecules.
Calcium oxide
Five atoms are labelled V to Z
| Atoms | Mass Number | Atomic Number |
| V | 40 | 20 |
| W | 19 | 9 |
| X | 7 | 3 |
| Y | 16 | 8 |
| Z | 14 | 7 |
- Which one of these atoms
(1) contains 7 protons;
(2) has an electronic configuration 2, 7? - Write down the formula of the compound formed by atoms X and Y.
Number of valence electrons in carbon is ______.
Elements with stable electronic configurations have eight electrons in their valence shell. They are ______.
How many atoms of each kind are present in the following molecule:
water
Elements A, B and C have atomic number 17, 19 and 10 respectively.
Write down the formula of the compound formed by two of the above elements.
