Question

..ll T-Mobile 2:05 PM 29% 12) of the four elements most prevalent in living organisms, which element makes up the highest percentage? A) sulfur B) sodium C) oxygen D) potassium E) carbon 13) An atom of an element has atomic number of 6 and mass number of 14. From this information, we can determine that the nucleus has : A) 6 protons. B) 8 electrons. C) 8 neutrons. D) 6 protons and 8 electrons. E) 6 protons and 8 neutrons. 14) The chemical behavior of an atom is mostly determined by: A) number of protons. B) number of neutrons. C) outermost electron shell. D) size of the atom E) mass of the nucleus. 15) Ions with a negative charge are called A) cations. B) anions. C) radicals. E) isotopes. D) positrons. 16) Elements with atoms containing full outer shells of electrons A) will form ionic bond. B) will normally form isotopes C) will form hydrogen bond D) will form covalent bond E) are considered inert gases. 17) The symbol Mg2+ means that this atom has: A) two magnesium atoms. a magnesium ion that has lost two electrons. C) a magnesium ion that has gained two protons. a magnesium ion that has gained two electrons. E) a magnesium ion that has lost two protons. 18) When an atom is able to fill up its outer electron shell by sharing electron(s) with another atom, they form a: A) ionic bond B) covalent bond C) hydrogen bond D) anion E) cation 19) When you transfer electrons(s) from one atom to another atom. and the two atoms unite due to attracton of the opposite charges, A) ion is formed. B) free electron is formed. C) hydrogen bond is formed. D) ionic bond is formed. E) covalent bond is formed. 20) What is an example of a strong acid? A) NaOH B) H,0 NH4 E) NaCl C) HCI D)

Answer 1

12-answer is c ...,the most abudant element present in living organism is oxygen .approx 96% of body weight isx consits by 4 elements oxygen,carbon,hydrozen and nitrozen            13-answer is e 6 proton and 8 neutron,,atomic no=no. of proton so ,the no.of proton will be 6 and mass no.=no.of proton +no.of neutron ,so 14-6= 8 neutron. 14-answer isc, outermost shell is is the key to determining the chemical nature of atom,that how will it react to another atom   15-answer is b.ions are of two type one is anion and another is cation,so the ions which posses a negative charge are known as anions.       16-answer is e those elements have a complete outermost shell or have complete octate are considered inert gase such as helium and neon etc.,    17-answer is b this sign indicates that magnesium lost 2 electron due to which it gained +2 sign.      18-b(covalent bond) it is that type of bond which is formed by sharing,    19-answer is a ( ions are formed)      20-answer is c HCL .hydrochloric acid is the strongest acid among them.