1. why do atoms combine with each other? 2. what determines the reactivity of an atom?

1. The number of each electron in this shell determines how an atom combines with other atoms to form compounds.

2. The number of electrons in an atom's outermost valence shell governs its bonding behavior.

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

1) clean up you lab area2) dispose of the chemicals as instructed by your teacher3) put everything back where it belongs unless your teacher tells you otherwise4) dispose of gloves5) wash hands with soap and water