Description : Which one of the following best defines the word allotropes ? A Different structural forms of an element B A pair of substances that differ by H+ C Elements that possess properties intermediate between ... a specific number of neutrons E The different phases (solid, liquid or gas) of a substance
Last Answer : A Different structural forms of an element
Description : a) What is meant by periodicity in properties of elements with reference to the periodic table? (b) Why do all the elements of the same group have similar properties? (c) How will the tendency to gain electrons change as we go from left to right across a period? Why? -Science
Last Answer : (a) The repetition of same properties after definite interval is called periodicity in properties. (b) It is because they have same valence electrons therefore, have similar properties. (c) ... to right in a period because atomic size goes on decreasing and effective nuclear charge increases.
Description : Why the elements belonging to the same group do have similar chemical properties ?
Last Answer : Why the elements belonging to the same group do have similar chemical properties?
Description : What elements have similar properties with krypton?
Last Answer : What is the answer ?
Description : In 1866, John Newlands, an English scientist, arranged the then known elements in the order of increasing atomic masses. He found that every eighth element had properties similar to that of the first. He called it ... of Pentamates (2) Law of musical notes (3) Law of Octaves (4) None of the above
Last Answer : (3) Law of Octaves Explanation: Newlands compared his discovery to the octaves found in music and thus, he called it the ‘Law of Octaves’. It is also known as ‘Newlands’ Law of Octaves’.
Description : An arrangement of elements with similar properties placed together is called?
Last Answer : Periodic Table
Description : According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the
Last Answer : eighth element starting from oxygen
Description : X and Y are the two elements having similar properties which obey Newland’s law of octaves. How many elements are there in-between X and Y?
Last Answer : There are 6 elements between X and Y
Description : The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. a) Calculate the average atomic mass of elements X and Z. b) How is the ... this example? d) Give another example of a set of elements which are classified according to this law.
Last Answer : a) The average atomic mass of X and Z = 7 39 2 46 2 23 b) The average atomic mass of X and Z is equal to the atomic mass of Y c) The law illustrated in this example is Dobereiner’s law of triads. d) Another example of Dobereiner’s law is Calcium, Strontium and Barium.
Description : Law of octaves says that if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of elements
Last Answer : 7
Description : Which pair of words has similar denotions but different connotations?
Last Answer : daring and courageous
Description : FIND THE PAIR OF WORDS FROM THE OPTION THAT EXPRESS A SIMILAR RELATIONSHIP AS IN THE GIVEN PAIR OF WORDS: Rehearsal: Performance A. Entrapment: Game B. Engagement: Marriage C. Applause: Audience D. Antidote: Illness
Last Answer : ANSWER: B
Description : FIND THE PAIR OF WORDS FROM THE OPTION THAT EXPRESS A SIMILAR RELATIONSHIP AS IN THE GIVEN PAIR OF WORDS: Condemnation: Disapproval A. Ignorance: Patience B. Optimism: Insight C. Blasphemy: Irreverence D. Sorrow: Intention
Last Answer : ANSWER: C
Description : FIND THE PAIR OF WORDS FROM THE OPTION THAT EXPRESS A SIMILAR RELATIONSHIP AS IN THE GIVEN PAIR OF WORDS: Graceful: Movement A. Articulate: Speech B. Clean: Dirt C. Humorous: Laughter D. Docile: Rebellious
Description : FIND THE PAIR OF WORDS FROM THE OPTION THAT EXPRESS A SIMILAR RELATIONSHIP AS IN THE GIVEN PAIR OF WORDS: Rehearsal: Performance A. Entrapment: Game B. Engagement: Marriage C. Applause: Audience 22 D. Antidote: Illness
Description : Determine the relationship between the pair of words NUMERATOR : DENOMINATOR and then select the pair of words from the following which have a similar relationship: (A) fraction : decimal (B) divisor : quotient (C) top : bottom (D) dividend : divisor
Last Answer : (C) top : bottom
Description : Determine the relationship between the pair of words ALWAYS : NEVER and then select from the following pair of words which have a similar relationship: (A) often : rarely (B) frequently : occasionally (C) constantly : frequently (D) intermittently : casually
Last Answer : Answer: A
Description : What element has similar chemical properties to phosphorus?
Last Answer : Need answer
Description : How does silicon have similar properties as Al and P?
Description : Magnesium and calcium are in the same group on the periodic table. Which sentence best explains why they have similar properties?
Last Answer : C. They both have two......
Description : Isoenzymes are (A) Chemically, immunologically and electrophoretically different forms of an enzyme (B) Different forms of an enzyme similar in all properties (C) Catalysing different reactions (D) Having the same quaternary structures like the enzymes
Last Answer : Answer : A
Description : The cause of periodicity of properties (a) Increasing atomic radius (b) Increasing atomic weights (c) Number of electrons in the valency orbit (d) The recurrence of similar outer electronic configuration
Last Answer : Ans:(d)
Description : Why do Zr and Hf show similar properties ?
Last Answer : Ans It is due to similar ionic size which due to lanthanide contraction .
Description : (a) What are groups' and periods' in the periodic table'? (b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic ... Sizes of their atoms Their metallic characters Their valencies in forming oxides Molecular formulae of their chlorides -Science
Last Answer : (a) The vertical columns in the periodic table are called groups'. The horizontal rows in the periodic table are called periods'. (b) M' and N' belong to same period but group I ... oxides. Valency goes on increasing first and then decreases. MCI, NCI2 are molecular formulae of their chlorides.
Description : By which we can describe the properties of elements? -Technology
Last Answer : The properties of elements can be described through attributes.
Description : Properties of elements X: (i) Its amide is used as a reducing agent (ii) Its amalgam is used as reducing agent Properties of element Y: (i) It is an o
Last Answer : Properties of elements X: (i) Its amide is used as a reducing agent (ii) Its amalgam is ... in its maximum oxidation state is neutral in aq. Medium
Last Answer : Properties of elements X: (i) Its amide is used as a reducing agent (ii) Its amalgam is used as ... oxidation number of Y in this compound is `+4`
Last Answer : Properties of elements X: (i) Its amide is used as a reducing agent (ii) Its amalgam is used as reducing agent ... 3` and `+5` D. `-2` and `+4`
Description : What two elements in the periodic table have properties in common with Calcium?
Last Answer : Be, Mg, Ca, Sr, Ba, Ra. All the elements in that column haveproperties similar to each other.
Description : What groups of elements should have very different chemical properties in the periodic table?
Last Answer : Feel Free to Answer
Description : Which group has elements with the most diverse set of properties?
Last Answer : Group 4a Or group 14
Description : Are the properties of a compound are always the same as the properties of the elements in a compound?
Last Answer : Not always. For example sodium (Na), a metal that reacts violently with water, and chlorine (Cl), a yellow poisonous gas, combine to make table salt, which has none of these properties. But in others cases there are some similarities, like in a metal alloy.
Description : The periodic law states that the properties of elements will repeat when the elements are arranged by _______.?
Last Answer : increasing atomic number
Description : in addition to properties of elements, list at least two other things or events that are periodic?
Last Answer : hujhhgbhybjbujh
Description : What are the properties of 'f ' block elements?
Last Answer : they are of two types lanthanides and actinides
Description : Elements that show the properties of both metals and non-metals are called (a) Allotropes (b) Metalloids (c) Alloys (d) Colloids
Last Answer : Ans:(b)
Description : What are transition elements? (1) Elements whose two outermost shells are incomplete (2) Elements which possess properties of both, metals and non-metals (3) They have eight electrons in the outermost shell (4) Elements whose three outermost shells are incomplete
Last Answer : (1) Elements whose two outermost shells are incomplete
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 : This scientist gave the law- ‘Properties of elements are a periodic function of their atomic number.’ This property of the fundamental importance of atomic number was discovered by- (1) Johann Wolfgang Döbereiner (2) John Newlands (3) Dmitri lvanovich Mendeléev (4) Henry Moseley
Last Answer : (4) Henry Moseley Explanation: In 1913, Henry Moseley showed that the atomic number of an element is a more fundamental property than its atomic mass as described below.
Description : Elements showing properties of both met- als and non-metals are?
Last Answer : Metalloids
Description : Elements which are not distinctively metals and possess some physical properties of non- metals are called
Last Answer : metalloids.
Description : The similarity in the properties of a group of elements is because they have same number
Last Answer : of outer electrons.
Description : The Russian chemist who said that the properties of elements are periodic function of their atomic mass is
Last Answer : Dmitri Mendeleev.