What is the most abundant element in the known universe?

Q: Why are heavier elements not much larger than lighter elements?

A: The heavier elements are not much larger because of the greater electrical attraction by the greater…

Q: An Atomic Mass Unit is defined as the mass of a __________________________ . Group of answer choices…

A:

Q: The radioactive element Carbon-14 has a half-life of approximately 5730 years. A fossil is measured…

A: For a radio active material the rate of decay is directly proportional to the Amount of the radio…

Q: fe=? 5h 60N a= 3. 2トト しe

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Which of water, iron, ammonia, chromium, radon, and silicon are chemical compounds as opposed to…

A: We have to write the chemical compounds as opposed to elements

Q: 4) a. Which has the greater density 1 kg of water or 10 kg of water? Explain your answer.

A:

Q: Order the following elements by increasing atomic radius according to what you expect from periodic…

A: In the periodic table as we move from left to right the atomic radius decreases.Arsenic(As)is a…

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: A carbon atom, with a half-full outer shell of electrons—four in a shell that can hold eight—readily…

A:

Q: Choose the BEST answer to the following. When food is exposed to gamma radiation, the food (a)…

A: Answer: bi,e doesn’t become radioactive.

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: What are the characteristics of the three subatomic particles?

A: Protons, neutrons and electrons are the three main subatomic particles.

Q: The half-life of a certain radioactive substance is 9 years. What is the yearly decor factor?

A: Given,

Q: Hydrogen escapes from the earth's atmosphere more readily than oxygen, Why?

A: As hydrogen has the least mass among all the elements, its mass is less than that of oxygen as…

Q: The smallest particle of any chemical element that can exist by itself and yet retain the qualities…

A: Atom is the smallest part in which an element can be divided. We can divide matters into these…

Q: A radioactive isotope has a​ half-life of about 17 ​years, which means that if it starts with 1 kg…

A:

Q: The of Meitnerium is 30 minutes. This means the amount of halves every 30 minutes. If H(t) = 9000 *…

A: Given: The half-life (T1/2) of Meitnerium is 30 minutes. Introduction: The continuous emission of…

Q: ス 3alte e Valt rass 2134

A: (a)Find the equivalent resistance of the given circuit for first path.

Q: ) Elements with seven valence electrons are called   A. halogens   B. alkaline   C. noble gas…

A:

Q: The radioactive element Carbon-14 has a half-life of approximately 5730 years. A fossil is measure…

A:

Q: _7. crystalline hard condensed matter phases _8. finite & infinite-dimensional vector spaces _9.…

A:

Q: Name three different types of evidence for the existence of atoms.

A: Following are the three different type of evidence that proves the existence of the atoms.…

Q: Fill in the blanks with the missing items. Refer to the periodic table of elements The first one…

A: We use the properties: Atomic number = no of electrons Atomic mass = no. of protons + no. of…

Q: Is calcium a element or compound

A: Calcium is an element .

Q: What is meter bridge?

A:

Q: Elemental carbon has 6 protons and 6 neutrons. This is often described as carbon-12. Carbon-13 has 6…

A: Mass Number = Number of protons + Number of neutrons For Plutonium: Mass Number = 244 Number of…

Q: Potassium-40 decays to form Argon-40. The half-life of potassium-40 is 1.3 billion years. A mineral…

A: Given : Potassium-40 decays to Argon-40 Half life of potassium-40, t = 1.3 billion years Initial…

Q: Osmium has a density of 22.6 g/cm3. The mass of a block of osmium that measures 1.01 ст х 0.233 cm х…

A:

Q: . One isotope of oxygen has the atomic number 8 and the mass number 18. An atom of this isotope…

A: We know Isotopes have same atomic number (protons number ) but deferent mass number given oxygen has…

Q: Can gold be created from other elements ?

A: Gold is element whose atomic number is 79 and is represented by the symbol Au (which is the short…

Q: The smallest particle of any chemical element that can exist by itself and yet retain the qualities…

A: We know that, According to Dalton's atomic theory Matter is indivisible But it was wrong Further…

Q: This subatomic particle is what gves the nucleus an overall positive charge. This is the space…

A:

Q: The different colours seen in exploding fireworks are produced using different elements. Element…

A: When a firework is exploded it reacts with oxygen. When it reacts with oxygen the electrons are…

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: A sample of a radioactive element has a half-life of 180 days; what percent of this sample will…

A: The decay constant of a radioactive sample is given by :  The amount of sample left after 't' time…

Q: There are two isotopes of carbon. Carbon-14 is radioactive. Carbon-12 is stable. The half life of…

A: C-14 is the radioactive material and its half life time is 5730 yrs, therefore it decays with a…

Q: What are the five most common elements in living things?

A: Living things are composed of several elements, but there are certain elements which form the basic…

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: determine the number of hydrogen atoms required to obtain 1.0 kg of hydrogen.A hydrogen atom has a…

A: We know,

Q: If two 1/1 H fused to form 2/1 H , there would be   no change in mass   a change in mass of one…

A: Fusion of 2 hydrogen atoms to form a deuterium is to be described: This process occur in cores of…

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: The periods of the periodic table shows periodic trends O False O True

A: In the periodic table some properties follows periodic trends, such as electronegativity, electron…

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: Prehistoric cave paintings were discovered in a cave in France. The paint contained 13% of the…

A:

Q: Describe the basic structure of the atom, the substructure of all matter.

A: Structure of an atom. The atom is comprised of electron, proton and neutron. They are the subparts…

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

A: Elements chemically combine to form compounds.

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: