Cap 2 Atomos y la Tabla Periodica Flashcards

1
Q

Who suggested the name radioactivity to describe the spontaneous emission of particles or radiation?

A

Marie Curie

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2
Q

What is responsible for the positive charge in the nucleus of the atom?

A

Protons

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3
Q

Which is defined as atoms that have the same atomic number (z) but different mass numbers (A)?

A

Isotopes

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4
Q

How many neutrons are in 13C?

A

7

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5
Q

What is the mass number of a nitrogen atom with 8 neutrons in its nucleus?

A

15

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6
Q

The natural abundance of carbon -12 weighing 12.00000 amu is 98.93% and the natural abundance of carbon-13 weighing 13.003355 amu is 1.07? What is the average atomic mass?

A

12.011 amu

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7
Q

The natural abundance of copper-63 weighing 62.929599 amu is 69.17% and the natural abundance of copper-65 weighing 64.927793 amu is 30.83%. What is the average atomic mass?

A

63.55 amu

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8
Q

Which of the following series of elemental supymbols lists a metal, nonmetal, and a metalloid? Na, P, Cl
Ca, Cu, Si
C, K, C, As
Mg, O, S

A

C, k, C, As

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9
Q
Which of the following elements would you expect to have properties most similar to those of oxygen?
N
S
Pb
Ne
A

S

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10
Q

What is the name given for Group 7A?

A

Halogens

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11
Q

Which group is called the alkaline earth metals?

A

2A

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12
Q

How many atoms of magnesium are in 0.546 moles of magnesium?

A

3.3 x 10 a la 23 atoms

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