What are the five most common elements in living things?

Q: the periodic table, classify these elements as metals, nonmetals, or metalloids. Не Fe K # metal #…

A: Si (Silicon) is metalloid   He (Helium) is non metal

Q: sulfur -> silver sulfide Ag Ag Ag Ag Ag Ag Ag Ag Ag Ag Ag Ag Ag SH Ag How many of each atom are in…

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Q: Explain the mechanism of nature on how other elements higher than Iron is being formed.

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Q: Name this compound: Be;N2 triberyllium dinitride triberyllium nitride O beryllium dinitride O…

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Q: Element X has 3 isotopes. One of the isotopes has a mass of 59.5 with an abundance of 43.3%. Another…

A: We know that, Average atomic mass of an element is a weighted average of all masses of all isotopes…

Q: Nuclear bombardment of the element molybdenum with deutrons resulted in the first synthetic element,…

A: Nuclear bombardment take place when reaction happens. Nuclei can undergo reactions which result in…

Q: Write the complete nuclear symbol (with neutron number) for each. (Enter your answer in the form…

A: Isotopes of an element have same atomic number but different mass number. Different isotopes of an…

Q: Lithium has only two naturally occuring isotopes: lithiumi-6 and lithium-7.  Lithium-6 has a mass of…

A: The atomic mass of lithium can be determined by the following expression.

Q: lease explain analysis solution and numeric solution

A: Given :- The two identical charge q = 6.40 x 10-19 C  The force between them is F = 4.20 x 10-9 N…

Q: Which substance is an element? O 1. CH4 O 2. NaCl O 3. N2 O 4. NO2

A: N2 is an element. N2 is the nitrogen atom or element.

Q: how many outer orbital electrons are found in an atom of Ra

A: A Radium atom have 88 electrons and 88 protons with 2 electrons in the outer shell. So outer orbital…

Q: Thorium and radium used to be put in face creams back in the 1900s. Why is this no longer done?

A: Thorium and Radium are radioactive elements.It pose as a great health hazard.It has a lot of harmful…

Q: The half-life of an element is 20 years. In how many years will there be 12.5% of the initial…

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Q: What is the most abundant element in the known universe?

A: There are 114 known elements in the universe.

Q: Express the nuclear composition for each below: (a) C-14 (b) a common stable Potassium atom (c)…

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Q: 30 As the atomic number increases across period 3 of the periodic table (A) (B) (C) (D) The…

A: This can be easily be solved by applying the basic concept of periodic table.

Q: adioactive substance has a half life of 30 minutes. How much of a sample of this substance will not…

A: Given, No = 100%= 1 T= 30min t= 2.5 hours = 150 min We know that, N= No (1/2)t/T

Q: Which of the following is not an element: hydrogen, carbon, oxygen, water?

A: An element is a pure substance which means it consists of only one type of atoms. When the atoms of…

Q: How many unpaired electrons are present in the isolated carbon atom ( atomic number = 6)' A. none B.…

A: To find: How many unpaired electrons are present in the isolated carbon atom (atomic number = 6).…

Q: Which are more prominent in the food we eat, carbon-12 or carbon-14?

A: In our body the ratio of carbon C-14 to C-12 is 1/100 billion.  The isotope C-14 makes up not more…

Q: Given: a sample of copper has a mass of 48.62 g when measured in air and a mass of 43.19 g when…

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Q: Which of these is a synthetic element? terbium (65) mercury (80)     fluorine(9) hassium (108)

A: Synthetic element

Q: You could swallow a capsule of germanium without ill effects. But, if a proton were added to each of…

A: One can swallow a capsule of germanium without ill effects. Because it contains 32 protons…

Q: Carbon dating is a process where scientists evaluate the percentage of Carbon-14 atoms that have…

A: Radiocarbon dating is a method that provides objective age estimates for carbon-based materials that…

Q: The half-life of lodine-131 is 8.0 days. 100 mg of lodine is given to a patient to treat…

A: Using the equation below, we can determine how much of the original isotope remains after a certain…

Q: The atomic masses of four element samples are shown in the table below. What would be the most…

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Q: What kind of basic force pulls electrons close to the atomic nucleus?

A: The positive charge of nucleus pulls the electrons close to the atomic nucleus. The nucleus of an…

Q: In the periodic table, elements are classified as ____________ according to their properties and…

A: Periodic table contains all the known elements in a well arranged manner according to their physical…

Q: half-life of an element is 20 years. In how many years will there be 12.5% of the initial material…

A: Given T1/2 = 20 years

Q: Comple.. e table below, using the diagram of an atom shown at right. Properties of subatomic…

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Q: Atoms of two different elements must have different

A: Each element has an atomic number. The atomic number equals the charge on the nucleus. It therefore…

Q: While researching for her class presentation, karen has read that natural occuring Gallium consists…

A: Given in question -  60% Ga (atomic mass=68.911)                                    40 % of…

Q: The smallest unit of any element that retains the chemical properties of the element

A: The smallest unit of any element is its atom.

Q: Magnesium belongs to which representative group? halogens noble gases alkaline earth metals alkali…

A: The atomic number of magnesium is 12 which has an electronic configuration Ne3s2.That means it…

Q: Elements chemically combine to form 1. atoms. O 2. other elements. 3. isotopes. 4. mixtures. 5.…

A: Elements chemically combine to form compounds.

Q: What is the AXIS OF SYMMETRY of the graph? y 7 -6 -5 3 -2 -1 2 3 4 5 6 7 -4 Ox - 2 Ov--2 O x-- 2…

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The Bohr model

Students often get confused between Rutherford’s model and Bohr model of an atom. They interpret the postulates of both these models to be the same, which is incorrect. Rutherford’s model differs from Bohr’s model in the following ways: