Which information about an atom can a period number give you?(1 point) how many energy levels it has

the number of valence electrons it has

how many bonds it will make

the ionic charge it forms

In which of the following cases is work being done on an object? question 2 options: pulling a trailer up a hill carrying a box down a corridor suspending a heavy weight with a strong chain pushing against a locked door

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional