23. Which molecule has only covalent bonds? A. CO2 B. Al2O3 C. Mg3N2
24. The octet rule states that main group elements in the periodic table react to achieve a filled valence shell which consists of how many electrons? A. 2 B. 4 C. 8
25. Which of the following elements are found in the p-block and can form an octet? A. He, P, S, As B. P, S, O, C C. He, Ar, Kr, Ne
23.CO2 is only covalent bond
Al2O3,Mg3N2 are ionic compounds
24.The element eight electrons in it's valence shell. it is more stable is called octet rule.
C.8
25. The noble gas elements contains eight electrons in its valence shell. So they are more stable He,Ne,Ar,Ke,Xe
C. He, Ar, Kr, Ne
23. Which molecule has only covalent bonds? A. CO2 B. Al2O3 C. Mg3N2 24. The octet...
30. Which of the following molecules is polar? A) CC14 B) NH3 C) 503 D) CO2 E) BeF2 31. Rank the following elements in order of increasing atomic size: Ge, Rb, Ne, S A) Ge<RbNe <S B) Rb <S<Ne <Ge CS<Ne < Ge<Rb D) Ne<S<Ge<Rb E) Rb <Ge<Ne<S 32. Select the pair that has the larger atom or ion listed first. A) P, P3- B) Na+, Na C) S, 52- D) Mg2+, Mg E) Br, Kr 33. Which element has...
1. A molecule that has a single covalent bond is _____. A. CO2 B. CO C. Cl2 2. how many valence electrons does PO43- has? A. 29 B. 30 C. 31 D. 32
20. An atom of which of the following elements has the smallest ionization energy? A. CI C. Si B. P DS 21. An atom of which of the following elements has the largest second ionization energy? A. Cs С Ро B. Pb D. Ba Q89. 22. Which of the following forms the most stable anion in the gas phase? A. CI (electron affinity -349 kJ/mol) B. S (electron affinity = -200 kJ/mol) CO (electron affinity = -141 kJ/mol) D. C(electron...
Which nonmetal often violates the octet rule by only having six valence electrons in nonmetal compounds? B C Si N Ne
Chemistry CHE 140, 170, 180 о Goal: With reference only to the periodic table, to write the electron configuration of the ground state (lowest energy), gaseous, atoms. Tools: (1) A list of the electronic sublevels within the atom in order of their increasing energy. (Write the list, 1s 2s 2p <6s, in the boxes below as indicated, by inspection of the "Aufbau" diagram or of the periodic table, where the order is explicit) (ii) Fill in the box below each...
Which compound contains both ionic and covalent bonds? NaCN b) Naci c) HCI d) e) SO, CO2 13) The following equations represent the formation of compound MX. What is the oH for the electron affinity of X (8)? X: (8) ► 2x () AH = 60 kJ/mol M(s) → MB) AH = 22 kJ/mol M (8) ► M' (g) + e- AH = 118 kl/mol X (8) + e. → X (g) AH = ? M' (g) + x (8)...
Which of the following substances has covalent bonding? Select one: a. Al2O3 b. CaF2 c. Cl2 d. K2S
Which of the following atoms cannot exceed the octet rule in a molecule? a. CI b. O c. P d. S e. All of them can exceed octet Thionyl chloride is used as an oxidizing and chlorinating agent in organic chemistry. Select the best Lewis structure for SOCI_2, Which of the following molecules has a net dipole moment (polar)? a. BeCI_2 b. SF_2 c. KrF_2 d. CO_2 e. CCI_4 Write Lewis dot symbol for O^2-? Place the following in order...
20. Choose the diamagnetie species from below. a. Sn? b. As c. Br d. Cr e. None of the above is diamagnetic 21. How many valence electrons do the noble gases possess? a. 8 b. 1 d. 6 e 2 Identify the isoelectronic elements. a. Cl, F, Br, 1, At b. P3-, S-, Cl-, K, Ca²+ C. Ne, Ar, Kr, Xe, He d. N3, S2-, Br, Cst, Sr2+ e. Zn2+, Co2+, CuCr, Cd? 23. Choose the best Lewis structure for...
34) Which type of covalent bond is the strongest? A) double B) all covalent bonds are equal in strength C) single D) triple 34) 35) Halogens ae salt formers and can be found in group A) 17 B) 1 C) 2 35). D) 18 36) Anything that has mass and takes up space is defined as A) properties B) atoms C) molecules D) matter 37) The are A) 92 naturally occurring elements. B) 33 C) 18 D) 1 38) 38)...