o helium (He)
o hydrogen (H)
sodium (Na)
O argon (Ar)
Answer: helium(He)
Explanation: Helium has only 2 electrons in the outermost energy level, but all of the other elements in its column have eight.
To find the number of atoms in 0.450 grams of P2O5, you need to calculate the number of moles of P2O5 and then use Avogadro's number to convert it to the number of atoms.
To determine the number of atoms in 0.450 grams of P2O5, we need to use the molar mass of P2O5. The molar mass of P2O5 is 141.94 g/mol. Using this information, we can calculate the number of moles of P2O5 in 0.450 grams by dividing the mass by the molar mass:
Moles of P2O5 = mass / molar mass = 0.450 g / 141.94 g/mol = 0.00317 mol
Next, we can use Avogadro's number to convert the moles of P2O5 into the number of atoms:
Number of atoms = moles x Avogadro's number = 0.00317 mol x 6.022 x 1023 atoms/mol = 1.91 x 1021 atoms
#SPJ2
color
formation
shape
texture
The rocks are classified as igneous, metamorphic, and sedimentary use the formation for classification purposes.
The outermost of them, called the crust, is composed of three types of rocks: magmatic, sedimentary and metamorphic. They are defined through the origin of several minerals and can be characterized with chemical composition, texture or shape, but the most used specification is based on composition.
The property does Valerie use for classification purposes is formation.
See more about rocks at brainly.com/question/19930528
#SPJ5
Which substances are the reactants?
Answer:
reactants: HCl and NaOH
Explanation:
A chemical reaction or equation can be explained with reference of two components: the reactants and products
Reactants are atoms, molecules or ions that are present of the left side of the equation. These could either be a single entity which can break or decompose under a given conditions or they could combine with other entities appropriately to form new molecules, atoms, ions etc. These new molecules occupy the right side of the reaction and are termed as Products.
The given reaction is and acid-base neutralization reaction
HCl + NaOH -----> NaCl + H2O
Reactants:
HCl, hydrochloric acid
NaOH, sodium hydroxide
Products:
NaCl, sodium chloride
H2O, water