The prefix eka- comes from the Sanskrit word for “one.”Mendeleev used this prefix to indicate that the unknownelement was one place away from the known element thatfollowed the prefix. For example, eka-silicon, which we nowcall germanium, is one element below silicon. Mendeleevalso predicted the existence of eka-manganese, which was notexperimentally confirmed until 1937 because this element isradioactive and does not occur in nature. Based on the periodictable shown in Figure 7.1, what do we now call the elementMendeleev called eka-manganese?

Q: magnesium aluminum sulfur silicon

A: To solve this question,  it is very important to write electronic configuration of all the species…

Q: Which of the following has the smallest radius? OF ONe O Mg EN C

A: In the given question we have to find the smallest radius among the following ions and atom.  there…

Q: The first element of every group behaves differently from the other elements in the same group.…

A: Lithium shows anomalous behavior because it has the smallest size in the group. Since it has the…

Q: Assuming that the seventh period of the periodictable has 32 members, what should be the…

A: Atomic number is the unique property of the compound. It is basically the no. of protons that are…

Q: Explain why the s-block of the periodic table is twogroupswide, the p-block is six-groups wide, and…

A: The reason why s-block of periodic table is two groups wide, p-block is six-groups wide and d-block…

Q: It is possible to define metallic character as we do in this bookand base it on the reactivity of…

A: First Ionisation Enthalpy of Silver (Ag) is 731 kJ/mol and that of Manganese (Mn) is 717.4 kJ/mol…

Q: With the exception of helium, the noble gases condense toform solids when they are cooled…

A: The average distance between the nuclei of the bonded atoms is known as the bond length. The half of…

Q: 12 What element belongs to the s block? a. aluminum b. boron C fluorine d. helium 13. What element…

A: 12) The elements belonging to s block hydrogen are (H), lithium (Li), helium (He), sodium (Na),…

Q: 2- Which of the following is wrong? O A) The outermost shell electronic configuration of the Kr…

A: The question is based on concept of atomic structure. it involves writing electronic configuration…

Q: Tungsten has the highest melting point of any metal in theperiodic table: 3422 °C. The distance…

A:

Q: Despite the expected decrease in atomic size, there is an unexpected drop in IE1 values between…

A: Ionization enthalpy, IE, is also called ionization potential is the ability to remove the electron…

Q: The ionic substance strontium oxide, SrO, forms from thereaction of strontium metal with molecular…

A: The given question can be solved on the basis of the prior knowledge of the solid-state. a)…

Q: A. A main group element with the valence electron configuration 3s1 is in periodic group? It forms a…

A: According to octet rule, a element or ion is stable enough when it has its octet completed. i.e. 8…

Q: Consider the isoelectronic ions Cl- and K+. (a) Which ionis smaller? (b) Using Equation 7.1 and…

A: (a)

Q: 7.105 A student is given samples of three elements, X, Y, andZ, which could be an alkali metal, a…

A: Element Y is yellow Solid. The alkali metals can be eliminated from consideration because every…

Q: Which element has the largest atomic radius? explain your answer in a separate sheet. O H O F O Na

A: Given :- symbol of elements H, F, Na and O  To identify :- element with largest atomic radius

Q: Moseley established the concept of atomic number by studyingX rays emitted by the elements. The X…

A: a.

Q: A. A main group element with the valence electron configuration 4s' is in periodic group It forms a…

A:

Q: hich of the following is NOT true for the Group 1 A elements? a. Most of them are soft silvery…

A: Given : We have to choose the correct option about Group 1A elements.

Q: Which of the following is NOT an anomalous property of the period 2 elements? Select one: Oa. The…

A: Answer

Q: Placed the elements N, O, As, Se in order from least to greatest atomic radius. a. N<0< As < Se b.…

A: On going to left to right,size will be decreases

Q: m largest to smallest atomic radius (that is, their physical size). Of the elements available in…

A:

Q: Which one of the following statements is the best explanation for the increase of ionisation energy…

A: Given: energy of the alkaline earth metals increases when going up in a group.

Q: Which of the halogen elements has the highest density in its standard state? B) Which of the…

A:

Q: Elemental cesium reacts more violently with water than doeselemental sodium. Which of the following…

A: An atom is mainly composed of three sub-particles; electrons, protons and neutrons. These particles…

Q: (a) What is the trend in first ionization energies as one proceedsdown the group 7A elements?…

A: Moving from Fluorine to Iodine in group 7A, first ionization energies decrease and atomic radii…

Q: he simpliest oxide for Fe2+ is FeO. How does one come to that conclusion?   The simpliest oxide of…

A: The simplest molecular formula of any compound is that which has the atoms in simplest ratio. In…

Q: Hydrogen is an unusual element because it behaves in someways like the alkali metal elements and in…

A: (a)Electron affinity is the amount of the energy released on the addition of an electron to a…

Q: 20. Which of the following statement is NOT correct for the s-block elements? A The solubility of…

A: Ans  A The solubility of the sulfates of group II decreases down the group because the larger anion…

Q: In the same period of the Periodie Table the atomie radii are largest for clements of group: I…

A: Given a question of 4 period of periodic table  We have to state that which group will have the…

Q: Name each of the following oxides. Assuming that thecompounds are ionic, what charge is associated…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: metalloid

A: Metalloids are a very small group of elements present in periodic table which are having properties…

Q: for the element being described in each of the following. (Hint: Use the Periodic Table of Elements…

A: In a group of periodic table atomic radius increases , when we move from up to down. In a period of…

Q: The first element of every group behaves differently from the other elements in the same group.…

A: Lithium shows anomalous behavior because it has the smallest size in the group. Since it has the…

Q: 1. Arrange the following from largest to smallest ionic radius: Ge, Rh, V, In

A: The distance between nucleus to   the electron of outermost shell, is known as ionic radius. Arrange…

Q: A. A main group element with the valence electron configuration 35 is in periodic group 2 It forms a…

A: Answer for A.: Mg, +2 Answer for B.: Se, -2

Q: As we move across a period of the periodic table, why dothe sizes of the transition elements change…

A: The reason is as given below;

Q: Explain how the following properties change across the periodic Table from group 1 to group  2, and…

A: d) Melting point increases across a period.  Melting point is the  temperature at which a substance…

Q: 5. Placed the elements N, O, As, Se in order from least to greatest atomic radius. a. N<0<As < Se b.…

A: The question is based on the periodicity of elements. we have to arrange the given atoms in…

Q: Which of the following statements is/are true? I. Solids are compact but if melted it moves…

A:

Q: 8. For the elements across period 2 of the Periodic Table, lithium (Li) to Neon (Ne) the melting…

A: Periodic table consists of 18 groups and 7 periods. Metals are placed on left side of the periodic…

Q: (a) Account for formation of the following series of oxidesin terms of the electron configurations…

A: (a) The oxidation state of Oxygen is -2. K2O CaO Sc2O3 TiO2 V2O5 CrO3

Q: Which of the following is not true? O a. The transition metals are characterized by partially filled…

A:

Q: Arrange in order of increasing nonmetallic character. (Use the appropriate symbol to separate…

A: Non metallic character : It is the tendency of elements to gain electron and form negative ions…