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CHMA10H3 Chapter : ATOMIC STRUCTURE.docx

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School
UTSC
Department
Chemistry
Course
CHMA10H3
Professor
Shadi Dalili

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CHMA10H3 Full Course Notes
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CHMA10H3 Full Course Notes
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Document Summary

Elements beyond uranium do not occur naturally, hence must be synthesized. Atoms of the same element do not necessarily have the same mass isotopes. Usually, in a neutral atom, the number of electrons is equal to the number of protons but in a ion, the atom gains or losses electrons. Its a game of adding and subtracting electrons, number of protons don"t change. Neutrons maybe increases when electrons are lost, which will be reflected in the mass number. Atomic mass of an atom is the relative mass of an atom compared to mass of a carbob-12 atom, Carbon-12 atom is used as a standard with an assigned mass of 12. 1 amu is 1/12 the mass of the carbpn-12 atom. More common: atomic weight: weight in grams of one mole of an atom. A mole: unit used to count particles, represented by avagadro"s number : 6. 022 x10 ^23. Rutherford theory the atom has a positively charged nucleus.

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Related Questions

Identify the missing information for each atom or ion. Note that the atoms and ions are not necessarily neutral.

A Se ion has a mass number of 78 and a charge of Ć¢ĀˆĀ’2 . Determine the number of neutrons, protons, and electrons in this ion.

number of neutrons:

number of protons:

number of electrons:

An ion has a mass number of 65, 36 neutrons, and a charge of +1 . Identify the element symbol, and determine the number of protons and electrons in this ion.

element symbol:

number of protons:

number of electrons:

An atom or ion has 42 neutrons , 36 protons, and 36 electrons. Identify the element symbol, and determine the mass number and charge for this atom or ion.

element symbol:

mass number:

charge:

The "atomic weight" (also called the "mass number") of an element gives:

Select one:

a. only the specific number of protons in an atom

b. only the specific number of neutrons in an atom

c. the combined number of protons and electrons in an atom

d. the combined number of protons and neutrons in an atom

e. none of the above

Is the mass of an isotope a whole number?

a.Ā No, electrons do not contribute to the mass.

b.Ā Yes, it is a whole number because it is the number of protons, neutrons, and electrons in an atom.

c.Ā No, it is the relative mass of an isotope compared to carbonāˆ’12.

d.Ā Yes, it is a whole number because it is the number of protons in an atom.