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IRINA SOSELIA 4 preguntas

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Preguntas del test (4)

1 One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?
1. A1 kilogram
2. B400 grams
3. C250 grams
4. Dpractically none
2What do you call an atom that has more protons than electrons?
1. Aa molecule
2. Ban isotope
3. Can anion
4. Da cation
3 Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?
1. AHelium
2. BArgon
3. CChlorine
4. DKrypton
4 What is the most common isotope of hydrogen?
1. AProtium
2. BDeuterium
3. CTritum
4. DHydrogen only has one isotope!