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  • What are some examples of ionic compounds? + Example - Socratic
    Lets take the ionic formula for Calcium Chloride, CaCl_2 Calcium is an Alkaline Earth Metal in the second column of the periodic table This means that calcium has 2 valence electrons it readily gives away in order to seek the stability of the octet This makes calcium a Ca^(+2) cation Chlorine is a Halogen in the 17th column or p^5 group Chlorine has 7 valence electrons It needs one
  • Question #021e1 - Socratic
    Alternatively, you can write A = Z +no of neutrons Grab a Periodic Table and look for zinc, Zn You'll find it located in period 4, group 12 Look at its element box and make a note of its atomic number As you can see, zinc has Z = 30 You already know from the nuclide's isotope notation that A = 66 This means that you have
  • Why does shielding effect increase down a group? - Socratic
    Shielding increases DOWN a Group because the nuclear core is farther removed from the valence electrons Complete electron shells shield the nuclear charge very effectively The best way to appreciate this is to consider the atomic radius, period by period Across the Period, from left to right, the atomic radius progressively decreases The nitrogen atom is larger than the oxygen, which is
  • Question #9d679 - Socratic
    An alpha particle has a proton number of 2 and mass number of 4 So we need to subtract 2 from Americium's proton number, that will be the proton number for the daughter nucleus: 95 – 2 = 93 Now look up the element with that proton number on the periodic table Neptunium has a proton number of 93 The mass number of the isotope is calculated by subtracting 4 from Americium's mass number: 246
  • Question #e0052 - Socratic
    The atomic number is the number of protons in the nucleus so is different for each element E g helium is written ""_2^4He The bottom number is the atomic number, also known as the proton number The top number is the mass number and is equal to the sum of the protons + the neutrons in the nucleus These are the particles that make up the mass of the atom There is no need to learn atomic
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