# Block of the periodic table the last partially filled

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block of the periodic table. The last partially filled sublevel of yttrium is 4 d . Hint 2. Identify which elements have their final electrons either filling or partially filling a sublevel of the fourth energy level Which of the following elements have their final electrons either filling or partially filling a sublevel of the fourth energy level? Check all that apply. The atomic mass will be between 28 and 29 \rm amu . 29 and 30 \rm amu . 28.36 {\rm amu} Typesetting math: 92%
Check all that apply. Hint 3. Determine which block each element resides in on the periodic table Sort each element into the block it resides in on the periodic table. Use the periodic table below or in the Resources menu as a guide. Drag the appropriate items to their appropriate bins.
Correct Finding the last occupied sublevel of an element requires locating it on the periodic table, understanding where each block resides, and understanding how sublevels relate to the periods of the periodic table for each block. Abbreviated electron configurations Abbreviated electron configurations use a bracketed chemical symbol (to represent the electron configurations) of a noble gas (group 8A or 18) as the starting point for an electron configuration for an element in the next row after whichever noble gas is chosen. For example, the abbreviated electron configuration for scandium would be \rm [Ar]4s^23d^1 as opposed to \rm 1s^22s^22p^63s^23p^64s^23d^1 . Part B Match each complete or abbreviated electron configuration with the element it corresponds to, assuming that each configuration is for a neutral atom. Drag the appropriate items to their appropriate bins. Hint 1. How to approach the problem There are two methods for identifying an element based on a given electron configuration. One is to locate the last occupied sublevel and count down the period the correct number of electrons. For example, the last occupied block sublevel for the electron configuration \rm 1s^22s^23p^64s^1 is the 4 s sublevel. Since the exponent following 4 s is 1, then the first element in this sublevel block is the element matching this electron configuration. In this case, the element is potassium ( \rm K ). The second method involves adding the electrons represented by the exponents in the electron configurations. For example, the electron configuration \rm 1s^22s^23p^4 displays 8 electrons (2 + 2 + 4 = 8). Thus, this electron configuration corresponds to the element with an atomic number of 8, oxygen ( \rm O ). For abbreviated electron configurations, add the exponents to the atomic number of the noble gas being referenced. For example, the electron configuration \rm [Ne]3s^23p^5 has 10 + 2 + 5 = 17 electrons. The element corresponding to this electron configuration is chlorine ( \rm Cl ). Hint 2. Determine how many electrons are represented in an electron configuration How many electrons are represented by the following electron configuration: \rm [Ar]4s^23d^{10}4p^4 ?