Interpretation: The reason for placement of argon before potassium in spite of its greater atomic mass and the
Concept Introduction:
Periodic Table: The available chemical elements are arranged considering their
In periodic table the horizontal rows are called periods and the vertical column are called group.
In periodic table the horizontal rows are called periods and the vertical column are called group. There are seven periods and 18 groups present in the table and some of those groups are given particular name as follows,
Atomic Number: Atomic number of the element is equal to the number of protons present in the nucleus of the element which is denoted by symbol Z. The superscript presents on the left side of the
Atomic mass: It is generally expressed in terms of atomic mass unit
Mass number: It is given by the total number of protons and the neutrons present in the nucleus of the element and it is denoted by symbol A. The subscript that lies on the left side of the symbol of the element represents the mass number.
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CHEMISTRY: ATOMS FIRST VOL 1 W/CONNECT
- A main group element with the valence electron configuration 2s22p3 is in periodic group__________ .It forms a monatomic ion with a charge of___________arrow_forwardExplain the organization of an atom of carbon.arrow_forwardArrange in order of increasing nonmetallic character. (a) the period 4 elements Ga, Ge, Ti (b) the Group 5A elements P, Bi, and Narrow_forward
- Some versions of the periodic table show hydrogen at the topof Group 1A(1) and at the top of Group 7A(17). What properties of hydrogen justify each of these placements?arrow_forwardHow can iodine (Z=53) have a higher atomic number yet alower atomic mass than tellurium (Z=52)?arrow_forwardWhich of the following ions are unlikely to be found in a chemical compound: Cs+, ln4+, Fe6+, Te2, Sn5+, and I? Explain briefly.arrow_forward
- Two elements are in the same group, one following the other. One is a metalloid; the other is a metal. Both form oxides of the formula RO2. The first is acidic; the next is amphoteric. Identify the two elements.arrow_forward2-89 Assume that a new element has been discovered with atomic number 117. Its chemical properties should be similar to those of astatine (At). Predict whether the new element’s ionization energy will be greater than, the same as, or smaller than that of: (a)At (b)Raarrow_forward2)Why did the observed chemistry of thallium mislead Mendelev to place the group 13 element (Tl) in a group with Li ,Na, K ,Rb ,and Cs ?arrow_forward
- I need help with this question that is attached. Table 1.4 gave the ionic radii in pm. For k+ it was 138(6), 151(8),159(10) and for f- it was 128(2), 132(4), 133(6). Table 1. 5 gave ionization energies in kj/mol. For k they were 419, 3051 and 4410. For f it was 1681,3375, and 6050. Table 1.6 gave electron affinities in kj/mol and for k it was 48 and for f it was 328. I've also attached the resource tablearrow_forwardAn atom with a stronger electron affinity is often more reactive. Given a pressurized chamber containing H2, which species would you expect to react more with hydrogen, Cl or Br? Explain.arrow_forwardWhat are the properties of the element flerovium (the period 7 element in group 14)?arrow_forward
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