1. Bellwork- Excited? 1s 2 2s 2 2p 6 3s 2 3p 5 4s 2 3d 10 4p 4 What element is this? Does this electron configuration represent an atom in an excited state or in its ground state? Explain.
2. Bellwork- Excited? 1s 2 2s 2 2p 6 3s 2 3p 5 4s 2 3d 10 4p 4 What element is this? As Does this electron configuration represent an atom in an excited state or in its ground state? Explain.
3. Bellwork- Excited? 1s 2 2s 2 2p 6 3s 2 3p 5 4s 2 3d 10 4p 4 What element is this? As Does this electron configuration represent an atom in an excited state or in its ground state? Explain. This As atom is in an excited state; One of the four electrons in the 4p sublevel could relax because a lower energy 3p orbital is unfilled.
10. A neutral atom contains an equal number of protons and electrons. When an atom gains or loses electrons it is no longer neutral. It becomes a charged ion. An ion has a charge.
11. If an atom or a compound becomes charged it is called an ion
12. A positive ion is called a cation A negative ion is called an anion Positive + Positive + Positive +
14. When an atom gains an electron it gains an additional negative charge. A Chlorine atom will gain one electron to become a Chlorine anion. Cl e - _
15. An Oxygen atom will gain two electrons making an Oxygen ion with a charge of negative two. O e - e - _ 2-
16. Atoms of elements from the left side of the periodic table will lose electrons. When an atom loses an electron it has more protons than electrons, so it is a positively charged ion.
17. Sodium will lose one electron to create a sodium ion with a “plus one” charge Na e - +
18. A Magnesium atom will lose two electrons to form an ion with a charge of positive two. Mg e - + e - 2+
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Notes de l'éditeur
This diagram lists the atomic radii of seven nonmetals. An atomic radius is half the distance between the nuclei of two atoms of the same element when the atoms are joined.
The size of atoms tends to decrease from left to right across a period and increase from top to bottom within a group. Predicting If a halogen and an alkali metal are in the same period, which one will have the larger radius?
This graph plots atomic radius versus atomic number for 55 elements. INTERPRETING GRAPHS a. Analyzing Data Which alkali metal has an atomic radius of 238 pm? b. Drawing Conclusions Based on the data for alkali metals and noble gases, how does atomic size change within a group? c. Predicting Is an atom of barium, atomic number 56, smaller or larger than an atom of cesium (Cs)?
First ionization energy tends to increase from left to right across a period and decrease from top to bottom within a group. Predicting Which element would have the larger first ionization energy—an alkali metal in period 2 or an alkali metal in period 4?
