The element tin (sn) has 18 different isotopes. which of the following is true about all of these isotopes? a. they all have the same number of protons b. they all have the same number of neutrons c. they all have different chemical properties d. they all have the same atomic mass

All isotopes have different number of neutrons and hence different atomic masses. Also they have the same electronic configuration and since the chemical properties are determined by this configuration, they all have the same chemical properties; therefore the answer is C)The all have the same number of protons.

on december 1, 1774, the continental association was created to boycott all contact with british goods. by reversing the economic sanctions placed on the colonists, the delegates hoped britain would repeal its intolerable acts.

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !