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.

What is the difference between cytokinesis in plant and animal cells? animal cells dived by a cleavage furrow. plant cells divide by a cell plate that eventually becomes the cell wall. cytoplasm and cell membranes are necessary for cytokinesis in both plant and animals.