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

Explain the term minorities ? why do they lag behind the majority community both educationally and economically ? how can they get their rightful place in society

What is generally true of the lower house in a state legislative branch ?

The persians landed in the plains near athens. as their army greatly outnumbered that of the greeks, the greeks hoped to find aid from nearby sparta. a long-distance runner named pheidippides was sent from athens to sparta to request , but the spartans were not able to send more soldiers at the time. regardless, the greeks were still able to win the battle. centuries later, legend developed that a runner had been sent from the battle to athens after the greek victory. after reaching athens, the runner proclaimed, "we are victorious! " and then fell to the ground and died. this legendary story is the inspiration for the modern long-distance runs that are performed today. this passage refers to the events of which battle during the persian wars? a. battle of thermopylae b. battle of salamis c. battle of plataea d. battle of marathon