The element lithium has two stable isotopes, li-6 and li-7. how do the atomic structures of these two isotopes compare? a) both have 3 protons and 3 electrons, but li-7 has 4 neutrons. b) both have 3 protons and 4 neutrons, but li-7 has 4 electrons. c) li-6 has 3 protons and 3 electrons; li-7 has 3 protons and 4 electrons. d) li-6 has 3 protons, 3 neutrons, 6 electrons, while li-7 has 3 protons, 3 neutrons, and 7 electrons.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

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