Zadanie 6
What is the maximum number of electrons that can occupy a single orbital of the 4d sublevel? A. 2 B. 5 C. 10 D. 14
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What is the maximum number of electrons that can occupy a single orbital of the 4d sublevel? A. 2 B. 5 C. 10 D. 14
A sample of an element contains two isotopes. The table shows their mass numbers and their abundances. Which value is the relative atomic mass of the element? A. 40 B. 41 C. 42 D. 44
Which oxides form an acidic solution when they react with water? I. sulfur trioxide II. phosphorus(V) oxide III. calcium oxide A. I and II only B. I and III only C. II and III only D. I, II and III
Elements X, Y and Z are in the same period of the periodic table. The relative sizes of their atoms are shown below. Which row shows the correct general trends? A. Ionization energy: Z < Y < X; electronegativity: Z < Y < X; acidity of oxide, least to most…
Which is the electron configuration of an atom of a metallic element? A. [He] 2s2 2p3 B. [Ne] 3s2 3p5 C. [Ar] 3d6 4s2 D. [Ar] 3d10 4s2 4p4
Which element is found in group 6 and period 5 of the periodic table? A. Chromium B. Molybdenum C. Tellurium D. Tungsten
A compound consists of Al3+ and SO42− ions. What are the name and formula of the compound? A. Aluminium sulfite, Al2(SO3)3 B. Aluminium sulfate, Al3(SO4)2 C. Aluminium sulfide, Al2S3 D. Aluminium sulfate, Al2(SO4)3
Which statement best describes the bonding between the atoms inside one molecule of ammonia, NH3? A. Hydrogen bonding between nitrogen and hydrogen atoms B. Each shared pair of electrons is attracted electrostatically to the nuclei of both bonded atoms…
Which statement explains the high melting point of magnesium oxide? A. Strong covalent bonds between magnesium and oxygen atoms must be broken B. Strong intermolecular forces hold magnesium oxide molecules together C. A large amount of energy is needed to…
What is the type of bonding in a solid that is brittle, has a high melting point, does not conduct electricity when solid but conducts when molten? A. Ionic B. Molecular covalent C. Metallic D. Giant covalent