2. True or false a) 24/12Mg has one more proton than 25/12Mg b) 23/11Na has one less subatomic particle than 24/11Na c) K and Rb would have similar chemical properties. d) Oxygen-16 and oxygen-18 would both have an atomic number of 8. e) Oxygen-16 and oxygen-18 would both have 10 neutrons. f) It is known that oxygen-16 reacts with magnesium metal. Oxygen-18 will also react with magnesium metal. II. Electronic configurations 1. Complete the following table: Atom or ion | Electronic Configuration | Group number of atom | # of Valence Electrons 6C | | | 13Al | | | 20Ca | | | 34Se | | | | 1s2 2s2 2p6 3s2 3p6 4s2 3d6 | | 53I | | | | 4p6 | | 56Ba | | | 82Pb | | | 16S2- | | |
Added by Robert K.
Close
Step 1
(Mg has 12 protons, Na has 11 protons) ** Show more…
Show all steps
Your feedback will help us improve your experience
Sri K and 69 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Answer true or false. (a) The majority (greater than $50 \%$ ) of the more than 300 naturally occurring isotopes are stable. (b) More artificial isotopes have been created in the laboratory than there are naturally occurring stable isotopes. (c) All artificial isotopes created in the laboratory are radioactive. (d) The terms "beta particle," "beta emission," and "beta ray" all refer to the same type of radiation. (e) When balancing a nuclear equation, the sum of the mass numbers and the sum of the atomic numbers on each side of the equation must be the same. (f) The symbol of a beta particle is $_{-1}^{0} \beta$ (g) When a nucleus emits a beta particle, the new nucleus has the same mass number but an atomic number one unit higher. (h) When iron-59 $\left(\frac{59}{26} \mathrm{Fe}\right)$ emits a beta particle, it is converted to cobalt- $59\left(\frac{59}{27} \mathrm{Co}\right)$ (i) When a nucleus emits a beta particle, it first captures an electron from outside the nucleus and then emits it. (j) For the purposes of determining atomic numbers in a nuclear equation, an electron is assumed to have a mass number of zero and an atomic number of -1 (k) The symbol for an alpha particle is $_{2}^{4} \mathrm{He}$ (1) When a nucleus emits an alpha particle, the new nucleus has an atomic number two units higher and a mass number four units higher. (m) When uranium- $238\left(^{238} \mathrm{U}\right)$ undergoes alpha emission, the new nucleus is thorium- $234\left(\frac{234}{90} \mathrm{Th}\right)$ (n) The symbol of a positron is $+1 \beta$ (o) A positron is sometimes referred to as a positive electron. (p) When a nucleus emits a positron, the new nucleus has the same mass number but an atomic number one unit lower. (q) When carbon-11 $\left(\frac{11}{6} \mathrm{C}\right)$ emits a positron, the new nucleus formed is boron-11 $\left(_{5}^{11} \mathrm{B}\right)$ (r) Alpha emission and positron emission both result in the formation of a new nucleus with a lower atomic number. (s) The symbol for gamma radiation is $\gamma$ (t) When a nucleus emits gamma radiation, the new nucleus formed has the same mass number and the same atomic number. (u) When a nucleus captures an extranuclear electron, the new nucleus formed has the same atomic number but a mass number one unit lower. (v) When gallium-67 $\left(\begin{array}{l}67 \\ 31\end{array}\right)$ undergoes electron capture, the new nucleus formed is germanium-67 $\left(_{32}^{67} \mathrm{Ge}\right)$
Answer true or false. (a) A proton and an electron have the same mass but opposite charges. (b) The mass of an electron is considerably smaller than that of a neutron. (c) An atomic mass unit (amu) is a unit of mass. (d) One amu is equal to 1 gram. (e) The protons and neutrons of an atom are found in the nucleus. (f) The electrons of an atom are found in the space surrounding the nucleus. (g) All atoms of the same element have the same number of protons. (h) All atoms of the same element have the same number of electrons. (i) Electrons and protons repel each other. (j) The size of an atom is approximately the size of its nucleus. (k) The mass number of an atom is the sum of the numbers of protons and neutrons in the nucleus of that atom. (1) For most atoms, their mass number is the same as their atomic number. (m) The three isotopes of hydrogen (hydrogen-1, hydrogen-2, and hydrogen-3) differ only in the number of neutrons in the nucleus. (n) Hydrogen-1 has one neutron in its nucleus, hydrogen-2 has two neutrons in its nucleus, and hydrogen-3 has three neutrons. (o) All isotopes of an element have the same number of electrons. (p) Most elements found on Earth are mixtures of isotopes. (q) The atomic weight of an element given in the Periodic Table is the weighted average of the masses of its isotopes found on Earth. (r) The atomic weights of most elements are whole numbers. (s) Most of the mass of an atom is found in its nucleus. (t) The density of a nucleus is its mass number expressed in grams.
Hitendra S.
(a) True or false: An element's number of valence electrons is the same as its atomic number. (b) How many valence electrons does a nitrogen atom possess? (c) An atom has the electron configuration 1$s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2}$ . How many valence electrons does the atom have?
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD