Description : Which of the following elements replaced eka-Aluminium in Mendeleev's Periodic Table? (1) Scandium (2) Gallium (3) Titanium (4) Germanium
Last Answer : (2) Gallium
Description : Why are isotopes not considered in Mendeleev’s periodic table?Name the elements which are predicted by Mendeleev as eka –silicon and eka –aluminum
Last Answer : Ans.Because Mendeleev gave priority to similarities in properties. Germanium and gallium
Description : State Mendeleev’s periodic law. Write two achievements of Mendeleev’s periodic table -Science
Last Answer : Mendeleevs Periodic Law: Properties of elements are the periodic function of their atomic masses. Achievements:i It could classify all the elements discovered at that time. ii It helped in the discovery of new elements. iii it helped in the correction of the atomic mass of some of the elements.
Description : How many stages are there in Mendeleev's Periodic Table ?
Last Answer : There are 7 stages in Mendeleev's Periodic Table .
Description : What is Mendeleev’s periodic law?
Last Answer : What is Mendeleev’s periodic law?
Description : Why did some of the elements did not match perfectly on Mendeleev's table?
Last Answer : Need answer
Description : What are the periods in Mendeleev's periodic table?
Last Answer : Because some of the elements were not yet discovered so he left them blank for other elements to be discovered. -bobby corner
Description : What is Mendeleev's periodic law?
Last Answer : the principle that chemical properties of the elements are periodic functions of their atomic numbersMendeleev's periodic law states that properties of elements are periodic functions of their atomic masses.
Description : Iron which resembles Cobalt and Nickel in properties has been placed far away from these elements. This was one of the limitations of : (1) Modern periodic table (2) Newland's law of octaves (3) Dobereiner's triads (4) Mendeleev's periodic table
Last Answer : (2) Newland's law of octaves Explanation: Among the major limitations of Newlands Law of Octaves, some similar elements have been separated from one another while some dissimilar elements have been placed in the same column.
Description : Mendeleev's periodic table was based on?
Last Answer : increasing order of atomic mass
Description : Compare the arrangement of elements in Mendeleev’s and Modern periodic table.
Last Answer : Mendeleev’s periodic table Modern periodic table 1. Elements are arranged in the order of increasing atomic masses. 1. Elements are arranged in the order of increasing atomic numbers.
Description : State the characteristics of Mendeleev’s periodic table.
Last Answer : 1) Mendeleev’s periodic table consists of 7 periods (horizontal) and 9 groups (vertical). 2) Elements are arranged in the increasing order of their atomic weights. 3) The elements that have similar property were placed in vertical columns.
Description : Mention the merits of Mendeleev’s periodic law.
Last Answer : Mendeleev left vacant spaces in the table for the elements that were to be discovered. He was able to predict the atomic mass and properties of elements even before their discovery. His periodic table helped to discover new elements like germanium.
Description : What was the Mendeleev’s basis for classification of elements?
Last Answer : Mendeleev’s classification is based on atomic mass.
Description : State Mendeleev’s periodic law.
Last Answer : Mendeleev’s periodic law states that “The properties of elements are periodic functions of their atomic mass”.
Description : MENDELEEV’S PERODIC TABLE
Last Answer : The physical and chemical properties of element are a periodic function of their atomic masses. The tabular arrangement of the element based on the periodic law is called Mendeleev's ... different properties. E.g. Manganese is placed with halogens which totally differ in the properties.
Description : Explain the Mendeleev’s Law of classification of elements also describe advantages & disadvantages of his periodic table.
Last Answer : Ans : Mendeleeve's Law of Classification : Mendeleeve in 1869 arrange elements in order of increasing atomic masses. He placed chemically similar elements vertically beneath each other & concluded that : The ... metals. No Idea Of Atomic Structure : It failed to give the idea of atomic structure.
Description : Which temperature does the gallium melt ? -Science
Last Answer : 29.76 °C or 85.6°F is the melting point of Gallium The Boiling Point is 4044°F (2229°C).
Description : At which temperature does the gallium melt ? -Science
Last Answer : The element gallium possesses some of the re- quisite properties for a heat-transfer liquid. It is a unique material, having a low melting point and a high boiling point. Pure gallium melts at 29.78°C, and suitable alloying will produce a metal which melts below room temperature.
Description : What is the sign of gallium ?
Last Answer : Ga Galliav's signal
Description : What is the number of electrons in gallium ?
Last Answer : The number of electrons in gallium is 31 .
Description : Is gallium a cation or anion?
Last Answer : Gallium is a metallic element. It forms cations Ga3+ and Ga+
Description : What can gallium create?
Last Answer : The chemical element gallium can create gallium compounds.Gallium nitrate is but one. There are many gallium compounds thatare critical to the semiconductor industry, and life as we know itgrinds to a halt without semiconductors.
Description : How many elements does gallium have?
Last Answer : Gallium is a chemical element. One might say it has one element.
Description : What kind of bond is gallium bromide?
Last Answer : Gallium bomide has an ionic bond.
Description : How much gallium is used a year?
Last Answer : Approx. 400 t gallium is used in a year.
Description : Which of the following cyclotron produced radiopharmaceuticals is used for assessing regional myocardial perfusion as part of an exercise stress test? (a) Thallous chloride 201TI USP (b) Sodium iodide 123I (c) Gallium citrate 67Ga USP (d) Indium 111In pentetate (e) Cobalt 57Co cyanocobalamin
Last Answer : Ans: A
Description : Tunnel diode is a: a) Power diode b) Has light doping c) Has heavy doping d) Is a reverse recovery diode Ans: C 76.LEDs are fabricated from: a) Silicon b) Germanium c) Si or Ge d) Gallium arsenide
Last Answer : Ans: D
Description : Which of the following metals is in a liquid state at normal room temperature? (a) Sodium (b) Radium (c) Gallium (d) Silicon
Last Answer : Ans:(c)
Description : One of the first satellite system catering personal based communications services scheduled for operation. A. Iridium system B. Plutonium system C. Indium system D. Gallium system
Last Answer : A. Iridium system
Description : What kind of battery panels are used in some advance satellites? A. Gallium Arsenide solar panel B. Germanium based panels C. Silicon based panels D. Gallium Phosphate solar panel
Last Answer : A. Gallium Arsenide solar panel
Description : It is the made from semiconductor material such as aluminum-galium-arsenide or gallium-arsenide-phosphide. A. APD B. Injection laser diode C. Light emitting diode D. Positive-intrinsic-negative
Last Answer : C. Light emitting diode
Description : __________ is a donor impurity for semi-conductors. (A) Boron (B) Antimony (C) Gallium (D) None of these
Last Answer : (B) Antimony
Description : What is/are oxidation states of gallium? Give its reason also.
Last Answer : Ans:+1 and +3 ,due to inert pair effect
Description : The metals with very low melting points which melts by the temperature of palm are A) Sodium and potassium B) Lead and magnesium C) Aluminium and zinc D) Gallium and caesium
Last Answer : D) Gallium and caesium
Description : The domain in a gallium-arsenide semiconductor has what type of electrical field when compared to the other regions across the body of a semiconductor?
Last Answer : A field of much greater intensity.
Description : The point on the current curve of a gallium-arsenide semiconductor at which it begins to exhibit negative resistance is called what?
Last Answer : Threshold.
Description : What happens to the electrons of a gallium-arsenide semiconductor when they move from the normal low-energy conduction band to the high-energy conduction band?
Last Answer : The electrons become immobile.
Description : Between silicon and gallium arsenide, which has the greatest index of refraction? ∙ A. Gallium arsenide ∙ B. Neither of silicon nor gallium arsenide ∙ C. Silicon ∙ D. They are equal
Last Answer : Gallium arsenide
Description : Which element is associated with the term "galvanized"? w) gallium x) zinc y) mercury z) nickel
Last Answer : ANSWER: X -- ZINC
Description : Mendeleev proposed the existence of an unknown element that he called eka-aluminum. The element is now called: w) magnesium x) silicon y) gallium z) germanium
Last Answer : ANSWER: C -- GALLIUM
Description : Which of the following metals is a solid at room temperature, yet melts in your hand? w) gallium x) cesium y) sodium z) magnesium
Last Answer : ANSWER: W -- GALLIUM
Description : Which of the following metals melts in your hand? w) gallium x) cesium y) sodium z) magnesium
Description : Have you ever predicted the future by seeing it in a dream first?
Last Answer : I've had that happen a few times for very minor things, in my case it's always been more amusing than anything else. Prepare yourself for a bunch of people with absolute statements about ... bias , a lot of Jellies tend to strongly express their views that stuff like this is impossible.
Description : For centuries mankind has predicted the cataclysmic end of Earth. What does this say about the psychological nature of humanity?
Last Answer : Apocalyptic beliefs are not universal. Hindus, for example, believe that the world is created, destroyed, and reborn in endless cycles spanning billions of years.
Description : A killing frost is predicted but my onions still have green tops
Last Answer : Put hay around and between them and cover with clear plastic...........keep a close watch on them...............or you could put hay bales around them and plastic on the top and when the tops ... get they get a little stronger. I love the small ones. You can also pickle them. Recipes on the web.
Description : What is the name of the science fiction writer from the 1930s that predicted virtual reality? -Gaming
Last Answer : In the 1930s a story by science fiction writer Stanley G. Weinbaum (Pygmalion's Spectacles) contains the idea of a pair of goggles that let the wearer experience a fictional world through holographics, smell, taste and touch.
Description : Python : convert machine learning predicted probabilities into binary class labels (0 or 1) -Web-Development
Last Answer : answer: