Cap 2 Atomos y la Tabla Periodica

Question 1

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

Answer 1

Marie Curie

Question 2

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

Answer 2

Protons

Question 3

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

Answer 3

Isotopes

Question 4

How many neutrons are in 13C?

Answer 4

7

Question 5

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

Answer 5

15

Question 6

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?

Answer 6

12.011 amu

Question 7

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?

Answer 7

63.55 amu

Question 8

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

Answer 8

C, k, C, As

Question 9

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

Answer 9

S

Question 10

What is the name given for Group 7A?

Answer 10

Halogens

Question 11

Which group is called the alkaline earth metals?

Answer 11

2A

Question 12

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

Answer 12

3.3 x 10 a la 23 atoms