(a)
Interpretation:
Whether the elements calcium, barium and radium are present in same group or period in the periodic table should be determined.
Concept Introduction:
An atom is composed of three main sub-atomic particles; electrons, neutrons and protons. The
(b)
Interpretation:
Whether the elements rhodium, cadmium and tin are present in same group or period in the periodic table should be determined.
Concept Introduction:
An atom is composed of three main sub-atomic particles; electrons, neutrons and protons. The atomic number of the elements represents the number of protons or electrons in a neutral atom. All known elements are arranged in a tabular form in increasing order of their atomic number that is called as the periodic table. The distribution of electrons in an atom can be shown with the help of electronic configuration. The electronic configuration of an element represents the number of electrons in different energy levels of an element.
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General, Organic, & Biological Chemistry
- 2.84 Early attempts to arrange the elements often focused on atomic weight. Mendeleev considered a number of properties in addition to atomic weight, so he realized that some elements seemed out of place when ordered by atomic weight. Using the modern periodic table, identify elements for which Mendeleev must have had to switch the order in order to get the correct sequence of elements.arrow_forward2-27 If each atom in Problem 2-26 acquired two more neutrons, what element would each then be?arrow_forward2-102 An element consists of 90.51% of an isotope with a mass of 19.992 amu, 0.27% of an isotope with a mass of 20.994 amu, and 9.22% of an isotope with a mass of 21.990 amu. Calculate the average atomic mass and identify the element.arrow_forward
- One of the best indications of a useful theory is that it raises more questions for further experimentation than it originally answered. Does this apply to Daltons atomic theory? Give examples.arrow_forwardIdentify each of the following elements as a metal, non-metal, or metalloid: (a) phosphorus, (b) strontium, (c) manganese, (d) selenium, (e) sodium, (f) krypton.arrow_forwardtrue or false (h) All atoms of the same element have the same number of electrons. (b) All atoms of the same element have the same number of protons. (m) The three isotopes of hydrogen (hydrogen1, hydrogen2, and hydrogen3) differ only in the number of neutrons in the nucleus. (a) Matter is divided into elements and pure substances. (b) Matter is anything that has mass and volume (occupies space). (c) A mixture is composed of two or more pure substances. (l) The combining ratio of 1:2 in the compound CO2 tells you that this compound is formed by the combination of one gram of carbon with two grams of oxygen.arrow_forward
- Examine the ratio of atomic mass to atomic number for the elements with even atomic number through calcium. This ratio is approximately the ratio of the average mass number to the atomic number. (a) Which two elements stand out as different in this set of ten? (b) What would be the "expected" atomic mass of argon, based on the correlation considered here? (c) Show how the anomaly in the ordering of natural atomic masses of argon and potassium can be accounted for by the formation of “extra" 40 Ar via decay of 4°K atoms.arrow_forwardConsider the following information about three atoms: (a) How are they similar to one another? (b) How do they differ from one another? (c) What are the members of such a group of atoms called? (d) Using the planetary model, draw the atomic configuration of 126C showing the relative position and numbers of its subatomic particles.arrow_forwardAn element has nine protons and 10 neutrons in the neutral atom. (a) How many electrons are present in the neutral atom? (b) What is the atomic number of this element? (c) Identify the element.arrow_forward
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