Which of the following has the greatest number of electrons?   a. Ca2+   b. K+   c. Cl-   d. S2-   e. They all have the same number of electrons

Q: 1. A scientist collects data on a sample of Lithium. He determines that 92.3% of the sample is…

A: The atomic mass of lithium = 6.938923 amu

Q: 1. Dalton's Atomic Theory. Dalton outlines four general postulates for his atomic theory. Explain…

A: Postulates of Dalton`s Atomic theory, Elements consist of indivisible small particles (atoms). All…

Q: A sample of element Z has two naturally occurring isotopes.  The isotope Z-24 makes up 68.9% of the…

A: Interpretation: We have to calculate average atomic mass.

Q: What are the main ideas in Dalton’s atomic theory?

A: Dalton was a well-known experimentalist and his significant studies on behaviours and properties of…

Q: 8) What kind of formular is C,H,O, consider as? A) Empirical formula B) Moleculr formula C)…

A: Protons and neutrons are present inside the nucleus and electrons are revolving around the nucleus…

Q: Find the mass of 236 atoms of tungsten in Kg

A: Tungsten is a chemic element having atomic number 74. Chemical symbol of tungsten is 'W'  According…

Q: 2/17/2021 Chapter 2 Concept Check on Atoms and Isotopes Chapter 2 Concept Check on Atoms and…

A:

Q: What is Joseph Proust contribution atomic theory?

A: He first published his Law of Definite Proportions (or Law of Constant Composition). The essence of…

Q: A 7.36-g sample of copper is contaminated with an additional 0.51 g of zinc. Suppose an atomic mass…

A: Atomic mass of a substance is the mass of the substance that is expressed in atomic mass units.…

Q: 7. 12.01 g of carbon has approximately 602,214,129,000,000,000,000,000 atoms. What is the…

A:

Q: 2.5 million atoms of particular element have a mass of 8.33X10^-16 grams. What is this element?

A:

Q: An isotope of mercury has 80 protons and 120neutrons. What is the mass number of this isotope?

A: The atom consists of 3 subatomic particles: Protons: They are positively charged particles present…

Q: If the cube with the same mass as part A is made of iron, determine the edge length of this cube (in…

A:

Q: Using this information along with the information in the table, calculate the % abundance and the…

A:

Q: What are isotopes? What is the percent natural abundance of isotopes?

A: Isotopes are stable as well as radioactive in nature.

Q: What is the atomic mass unit? a mass of a carbon atom b mass of a hydrogen molecule c (1/18) of…

A: What is the atomic mass unit?

Q: True or False -Atomic theory doesn't need to be taken seriously because it's just a theory ....

A: Given statement is, Atomic theory doesn't need to be taken seriously because it's just a theory

Q: Antimony (Sb), has two naturally occurring isotopes: Sb-121 that has a percent abundance of 57.30 %…

A: Given: Antimony (Sb) has two isotopes Sb-121 and Sb-123 Mass of Sb-121 =120.90 amu Percentage…

Q: Where are particles with virtually no mass found in the atom? A. The electron cloud B. Inside the…

A: Ans  A)  The electron cloud .

Q: The density of copper is 8.96 g/cm3. How many copper atoms are in a sphere with a volume of 0.475…

A: Mass = Volume x density Number of moles = Mass in gram/Molar mass Number of atoms = Number of moles…

Q: 19,9924 AMU is the mass of one of the three isotopes of neon equaling 90.4838%. One of the other two…

A: Here, the three isotopes of Neon is

Q: ow many protons does aluminum (Al) have? How many neutrons? How many electrons?

A: Aluminium  atomic number = 13  Electronic  configuration  of aluminium = 1s22s22p63s23p1

Q: A solid circular cone made of pure platinum (d = 21.45 g/cm3 ) has a diameter  of 2.75 cm and height…

A: Density of a substance is given by the ratio of mass to its volume. Density = MassVolume Volume of a…

Q: 1) C a b The number of lines exhibited by hydrogen(s) a is The number of lines exhibited by…

A:

Q: A 7.36 g sample of copper is contaminated with an additional 0.51 g of zinc. Suppose an atomic mass…

A: Total weight of the sample = 7.36 + 0.51 = 7.87 g Fraction of Copper in the sample can be calculated…

Q: 3) In a far away land and long ago, a series of experiments were carried out. Three samples of…

A: In 2) Use law of constang proportion Divide the both Kalium and pyron masses We see that A same and…

Q: A cube of gold that is 1.00 cm on a side has a mass of 19.3 g.A single gold atom has a mass of 197.0…

A: Atoms are packed orderly in a defined crystal lattice that is assumed to have any shape such as…

Q: In any neutral Adam there are equal numbers of? A. Neutrons and electrons B. Protons and neutrons…

A: Neutral atom are those having not any charge. They are wholely neutral

Q: Describe the experiment that provided the basis for ourunderstanding of the nucleus.

A: Describe the experiment that provided the basis for our understanding of the nucleus.

Q: . In the following figures, the open circles represent atoms of an element and the filled circles…

A: Dalton’s Atomic Theory: Dalton's Atomic Theory is based on law of conservation of mass and the law…

Q: Which idea came out of Rutherford’s gold foil experiment?a) Atoms contain protons and neutrons.b)…

A: Rutherford’s gold foil experiment is also called as Planetary model of the atom in which he told…

Q: Which pair of particles has the same number of electrons?

A: Total electrons in a cation = atomic number - total positive charge  Total electrons in an anion =…

Q: How many isotopes does this element have?

A: From the graph, it is cleared that the number of isotopes of the unknown element is 5.

Q: Draw a diagram of Rutherford's experiment and describe it. Include a full description of how the…

A: Rutherford uses a gold thin foil and alpha-particles and because of that this model is also known as…

Q: All parts of Dalton's theory on atoms is still accepted today. O True O False

A: Postulates of Dalton’s atomic theory is shown below: All matter is made up of individual particles…

Q: There are only two naturally-occuring stable isotopes of chlorine. The mass and natural abundance of…

A: Average atomic mass (AAM) :  AAM =isotopic mass x abundance 100   To find the mass of second…

Q: 1. A solid circular cone made of pure platinum (d = 21.45 g/cm3 ) has a diameter  of 2.75 cm and…

A:

Q: Imagine a new element (symbol X) has been found on Mars. Four isotopes of the element have been…

A: Average atomic mass of element X can be calculated by using the equation: Average atomic mass of X =…

Q: 14. Selenium-75 is used in the diagnosis of disorders related to the pancreas . How many (a) protons…

A: In a neutral atom the number of electrons and protons are same.

Q: Which statements are inconsistent with Dalton’s atomic theoryas it was originally stated? Explain…

A: The statements that are inconsistent with atomic theory of Dalton have to be identified and…

Q: Mercury has an atomic number of 80 and an atomic mass of 200. Mercury has number of protons, number…

A:

Q: the atoms listed below, which has the largest mass?   A. all have the same mass B. lead C. uranium…

A: Atoms which have more number of neutrons and protons have greater mass because mass is due to…

Q: For 223FT, number of protons = number of neutrons = + and number of electrons = For 227 Fr, number…

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

Q: An isotope of chlorine has 20 neutrons. •What is the mass number of the chlorine isotope? •How…

A: Atomic number = Number of protons = number of electrons Mass number = Number of protons + Number of…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.