The atomic number of an element is 19. Based on its electron arrangement, which of the following explains its correct position in the periodic table? Group 1, because it has a single electron in the 4s orbital. Group 4, because it has a single electron in the 4s orbital. Group 1, because its last electron is in the 3s orbital. Group 4, because its last electron is in the 4s orbital.
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It should be placed in a block 4th group because it has last electron in 4s1 orbital.
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