Question

Name an element in the fourth period (row) of the periodic table with the

following:
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a. two 3d electrons
b. three 4p electrons
c. four valence electrons
d. full s and p sublevels

Answer 1

Elements in the fourth period with specific electron configurations include Scandium with two 3d electrons, Arsenic with three 4p electrons, Germanium or Scandium with four valence electrons, and Krypton with full s and p sublevels.

Step-by-step explanation:

The question deals with identifying elements in the fourth period of the periodic table based on their electron configurations. The following outlines the answers:

• a. An element in the fourth period with two 3d electrons has the electron configuration [Ar]4s23d2. The corresponding element is Scandium (Sc).
• b. An element with three 4p electrons is one with the electron configuration [Ar]4s23d104p3. This describes Arsenic (As).
• c. An element with four valence electrons in the fourth period can either have these in the 4s subshell and the 3d subshell combined, such as [Ar]4s23d2, which is Scandium (Sc), or with the full 4s and beginning of the 3d subshell, like [Ar]4s23d104p2, which corresponds to Germanium (Ge).
• d. An element with full s and p sublevels in the fourth period has a total of eight valence electrons, with the electron configuration [Ar]4s23d104p6. This represents the noble gas Krypton (Kr).

Answer 2

An element in the fourth period of the periodic table with two 3d electrons, three 4p electrons, four valence electrons, and a full s and p sublevels is the transition metals.

Step-by-step explanation:

Based on the information given, an element in the fourth period of the periodic table with the specified characteristics is/are the transition metals. The transition metals are found in the d block of the periodic table and have electron configurations that include the filling of the 3d subshell. These elements have two 3d electrons, three 4p electrons, four valence electrons, and a full s and p sublevels. Examples of transition metals in the fourth period include chromium (Cr) and copper (Cu).