Use the periodic table to identify the element with the following electron configuration: a. 1s2 2s2 2p6 3s2 enter the symbol of the elementb. krypton 5s2 4d6 enter the symbol of the elementc. how many unpaired electrons are present in a ground-state atom from the halogen family: enter a number, such as 0, 1, 2, etcd. unpaired electrons in the 5a column: enter a number, such as 0, 1, 2, etce. unpaired electrons in the 6b column enter a number, such as 0, 1, 2, etc

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

If i add water to oil what will happen

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.