A Nitrogen Ion Has A Mass Of 14

Question: About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? A) carbon/ sodium/ hydrogen/ nitrogen B) carbon/ oxygen/ phosphorus/ hydrogen C) oxygen/ hydrogen/ calcium/ nitrogen D) carbon/ hydrogen/ nitrogen/ oxygen E) carbon/ oxygen/ nitrogen/ calcium
Answer: Answer: D
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Question: An atom with a positive charge has ______. A) more protons than electrons B) more electrons than protons C) more neutrons than protons D) more protons than neutrons E) equal numbers of electron and proton
Answer: Answer: A
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Question: The nucleus of a nitrogen atom contains 7 neutrons and 7 protons. Which of the following is a correct statement concerning nitrogen? A) The nitrogen atom has a mass number of approximately 7 daltons and an atomic mass of 14. B) The nitrogen atom has a mass number of approximately 14 daltons and an atomic mass of 7. C) The nitrogen atom has a mass number of 14 and an atomic mass of 7 grams. D) The nitrogen atom has a mass number of 7 and an atomic number of 14. E) The nitrogen atom has a mass number of 14 and an atomic mass of approximately 14 daltons.
Answer: Answer: E
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Question: Isotopes of an element have the same number of ____ and different numbers of _____. A) protons . . . neutrons B) protons . . . electrons C) neutrons . . . protons D) neutrons . . . electrons E) proton. ... electron
Answer: Answer: A
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Question: Oxygen has an atomic number of 8 and neutron number of 8. Thus what is the atomic mass of an oxygen atom? A) exactly 8 grams B) exactly 8 daltons C) approximately 16 grams D) approximately 16 daltons E) 24 amu (atomic mass units)
Answer: Answer: D
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Question: In what way are elements in the same column of the periodic table the same? A) They have the same number of protons. B) They have the same number of neutrons. C) They have the same number of electrons. D) They have the same number of electrons in their valence shell.
Answer: Answer: D
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Question: The bond between oppositely charged ions is a(n) ______ bond. A) polar covalent B) hydrogen C) ionic D) isotonic E) peptide
Answer: Answer: C
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Question: A covalent chemical bond is one in which A) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms. C) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. D) outer-shell electrons of one atom are transferred to fill the inner electron shell of another atom. E) an electron occupies a hybrid orbital located between the nuclei of two atoms.
Answer: Answer: C
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Question: The atomic number of each atom is given to the left of each of the elements below. Which of the atoms has the same valence as carbon ( )? A) 7N nitrogen B) 9F fluorine C) 10Ne neon D) 12Mg magnesium E) 14Si silicon
Answer: Answer: E
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Question: Electrons exist only at fixed levels of potential energy. However if an atom absorbs sufficient energy a possible result is that A) an electron may move to an electron shell farther away from the nucleus. B) an electron may move to an electron shell closer to the nucleus. C) the atom may become a radioactive isotope. D) the atom would become a positively charged ion or cation and become a radioactive isotope. E) the atom would become a negatively charged ion or anion.
Answer: Answer: A
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