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- Question
Atomic mass of first 30 elements?
- Correct Answer
- Here I give you the first 30 Atomic elements names and their Atomic masses Atomic number Element Atomic mass 1 Hydrogen 1 2 Helium 4 3 Lithium 694 4 Beryllium 901 5 Boron 1081 6 Carbon 1201 7 Nitrogen 1401 8 Oxygen 1599 9 Fluorine 1900 10 Neon 2018 11 Sodium 2299 12 Magnesium 2531 13 Aluminium 2698 14 Silicon 2809 15 Phosphorus 3097 16 Sulphur 3207 17 Chlorine 3545 18 Argon 3995 19 Potassium 3910 20 Calcium 4008 21 Scandium 4496 22 Titanium 4787 23 Vanadium 5094 24 Chromium 24 52 25 Manganese 5494 26 Iron 5585 27 Cobalt 5893 28 Nickel 5869 29 Copper 6355 30 Zinc 6541
- 1. Rust forms when _____ reacts with chemicals in rocks.
Options- A. Water
- B. Oxygen
- C. Nitrogen
- D. Carbondioxide Discuss
- 2. Which of the following elements has the lowest electronegativity
Options- A. Bromine
- B. Fluorine
- C. Carbon
- D. Lithium Discuss
- 3. Which of the following is not a monosaccharide?
Options- A. Fructose
- B. Glucose
- C. Galactose
- D. Sucrose Discuss
- 4. When combining with nonmetallic atoms, metallic atoms generally will
Options- A. Lose electrons and forms cations
- B. Gain electrons and forms anions
- C. Lose electrons and forms anions
- D. Gain electrons and forms cations Discuss
- 5. What is the bond order of O 2 ?
Options- A. 1.5
- B. 2
- C. 2.5
- D. 1 Discuss
- 6. Which one of the following elements is a transition element?
Options- A. H
- B. As
- C. Fe
- D. Sr Discuss
- 7. Which statement best describes the electronegativity of an element?
Options- A. Electronegativity of an atom is it's ability to produce energy while losing an electron.
- B. Electronegativity of an atom is it's ability to attract electrons during bond formation.
- C. Electronegativity of an atom is it's ability to lose electrons during cation formation.
- D. Electronegativity of an atom is it's ability to share electrons during a covalent bond formation. Discuss
- 8. What name is given to the bond between water molecules?
Options- A. Polar
- B. Polar covalent
- C. Hydrogen
- D. None of the above Discuss
- 9. Which three components are common to all amino acids? Discuss
- 10. What important polymer is located in the nucleus?
Options- A. Ribosomes
- B. Chromosomes
- C. DNA
- D. Proteins Discuss
Chemistry problems
Search Results
Correct Answer: Oxygen
Explanation:
Rust forms when oxygen reacts with chemicals in rocks, and that is often the case with many other elements in general. Like a copper nail being exposed to the air will rust.
Correct Answer: Lithium
Explanation:
Electronegativity is the tendency for an atom to attract electrons. There are general trends on the periodic table which you can use to determine the relative electronegativity for different elements, but otherwise you can also look at their valence shell and effective nuclear charge to determine their relative electronegativity.
Here from the given options, Lithium has least tendency to attract electrons and thus has a lower electronegativity.
Correct Answer: Sucrose
Explanation:
Sucrose is not a monosaccharide.
Monosaccharides are simple carbohydrates molecules that cannot be broken down into smaller molecules of other carbohydrates.
Glucose, galactose and fructose are examples of Monosaccharides.
Correct Answer: Lose electrons and forms cations
Explanation:
When combining with nonmetallic atoms, metallic atoms generally will Lose electrons and forms cations.
As the ionization energy of te metals are very low, so they can easily lose electrons and form positively charged ion called cations.
Correct Answer: 2
Correct Answer: Fe
Explanation:
In chemistry, the term transition metal has three possible meanings: The IUPAC definition defines a transition metal as "an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell".
Any of the set of metallic elements occupying a central block (Groups IVB?VIII, IB, and IIB, or 4?12) in the periodic table, e.g. iron, manganese, chromium, and copper. Chemically they show variable valency and a strong tendency to form coordination compounds, and many of their compounds are coloured.
Here in the given options, only iron (Fe) is a transition metal since Strontium is an alkaline earth, arsenic is a metalloid, hydrogen is (normally) a diatomic gas.
Correct Answer: Electronegativity of an atom is it's ability to attract electrons during bond formation.
Explanation:
Electronegativity, is a chemical property that describes the tendency of an atom to attract a shared pair of electrons (or electron density) towards itself.
Correct Answer: Hydrogen
Explanation:
The name given to the bond between water molecules is a hydrogen bond. These bonds occur between the slightly negative oxygen of one water molecule and the slightly positive hydrogen of another water molecule. Hydrogen bonding gives water special physical properties.
The differences in electronegativity between hydrogen and oxygen lead to an unequal sharing of electrons. Electronegativity measures how strongly an atom attracts electrons. Oxygen, with its higher electronegativity, pulls on the shared electrons more, giving the oxygen atom a partial net negative charge. The shared electrons spend less time with the hydrogen atoms; therefore, the hydrogen regions of water have partial positive charges.
Correct Answer: Any two amino acids vary structure by the r-group, otherwise all amino acids are in the same structure All amino acids have in common carboxyl group -COO , amino group -NH3+ and a hydrogen -H and a r-group which are all bonded to a central carbon
Correct Answer: DNA
Explanation:
The most important polymer present in the nucleus is DNA- the master molecule. It is a polymer of Nucleotides.
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