mass numbers and isotopes

Question 1

where is mass of an atom concentrated

Answer 1

nucleus

Question 2

charge of nucleus

Answer 2

positive

Question 3

how are electrons in the atom

Answer 3

orbiting, creating a cloud of negative charge

Question 4

what holds an atom together

Answer 4

electrostatic attraction between the positive nucleus and negatively charged electrons orbiting

Question 5

charge of an atom

Answer 5

neutral

Question 6

what determines the element

Answer 6

number of protons

Question 7

isotopes

Answer 7

atoms of the same element with the same number of protons but a different number of neutrons

Question 8

chemical symbol for isotopes

Answer 8

chemical symbol followed by a dash

Question 9

isotopes properties

Answer 9

same chemical properties but different physical properties

Question 10

why do isotopes have the same chemical properties

Answer 10

same number of outer shell electrons and electrons take part in chemical reactions

Question 11

why do isotopes have different physical properties

Answer 11

different number of neutrons which adds mass to the atom

Question 12

what is relative atomic mass

Answer 12

average mass of the isotopes

Question 13

relative atomic mass equation

Answer 13

(relative abundance1 x mass1) + (relative abundance 2 x mass 2) /100

Question 14

relative atomic mass definition

Answer 14

the ratio of the average mass of one atom of an element to one twelfth of the mass of the mass of an atom of carbon-12