Chapter 2: 9DQ (page 46)
Dalton assumed that all atoms of the same element are identical in all their properties. Explainwhy this assumption is not valid.
Elements different isotopes have different neutron number in the nuclei even proton number is constant.
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Name the following compounds.
a.b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
Q.2.The average diameter of an atom is m. What if the average diameter of an atom were 1 cm? How tall would you be?
Identify the elements that correspond to the following atomic numbers. Label each as either anoble gas, a halogen, an alkali metal, an alkaline earth metal, a transition metal, a lanthanidemetal, or an actinide metal.
a. 17
b.4
c. 63
d. 72
e. 2
f. 92
g. 55
Q.17. Why is calcium dichloride not the correct systematic name for CaCl2 ?
Consider the chemical reaction depicted below. Label as much as you can using the terms atom,molecule, element, compound, ionic, gas, and solid.
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