Answer:
F, F⁻¹, Br, Br⁻¹
Explanation:
Atomic radii:
It is the inter nuclear distance between bonded atom.
Trend along group:
When we move from top to bottom in a group atomic size increases with increase of atomic number because of addition of electron in next energy level. Thus nuclear attraction becomes weaker on valence electrons and size gets increased. Moreover shielding effect also protect the valance electrons from nuclear attraction.
when we move from bottom to top the atomic size decreases because of decrease in atomic number and energy level.
For example
In halogens the fluorine has smaller size than rest of halogens elements because it is present in top of this column. while bromine is present third to the fluorine that's why its atomic size is larger than fluorine. When an extra electron is added the atomic size becomes greater than neutral atom because of addition of electron to the next energy level. That's why anionic size is greater than neutral atom.
The given particles thus arranged in smallest to largest size in following order.
F, F⁻¹, Br, Br⁻¹
Scanning electron microscope (sem): an electron beam scans the surface of a specimen (coated with gold) that excites electron from the specimen which are detected and translated into an image that is three-dimensional. It is used to study the topography of a specimen
Transmission Electron microscope (TEM):a beam of electrons is passed through a thin section of specimen that is stained with atoms or heavy metals and electromagnets acts as lenses that focus the image onto a screen or film. It is used to study the internal structure of a specimen--cells
Answer:
True
Explanation:
The majority of the reactions happened with a flow of heat. When there's no heat, the reaction is adiabatic.
For no adiabatic reactions, the heat can be released (evolution) by the system, so the reaction will be exothermic, or absorbed by the system (absorption), then the reaction is called endothermic.
To calculate the moles of AgNO3 in a solution, we need to know the volume and concentration of the solution.
Moles of AgNO3 = Volume of AgNO3 solution (L) * concentration of AgNO3 solution (M or mole/L) = 1.50 L * 0.050 M = 0.075 mole.
So 0.075 moles of AgNO3 are present in 1.50 L of a 0.050 M solution.
metal- a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
non-metals- an element or substance that is not a metal.
metaloids- an element properties are intermediate between those of metals and solid nonmetals or semiconductors.
substance- a particular kind of matter with uniform properties.
physical properties- any property that is measurable, whose value describes a state of a physical system
luster- a gentle sheen or soft glow, especially that of a partly reflective surface.
conductivity- the degree to which a specified material conducts electricity, calculated as the ratio of the current density in the material to the electric field that causes the flow of current. It is the reciprocal of the resistivity.