Beastmode1551

11.11.2019 • 

Chemistry

1. the atomic number of an element is the total number of which particles in the
nucleus? (1 point).
neutrons
protons
electrons
protons and electrons

2. all atoms of the same element have the same (1 point)
a. number of neutrons
b. number of protons
c. mass numbers
d. mass

3. isotopes of the same element have different (1 point)
a. positions on the periodic table
b.chemical behavior
c. atomic numbers
d. mass numbers

Ответ:

lollipopboo

09.01.2022

Chemistry

---

Ad 1) - it's the number of protons. Incidentally, this is also the answer to the second question: the number of protons, counted as the atomic number is what distinguishes the elements.

Different isotopes of the same element have the same amount of protons but a different number of neutrons, which gives them a different atomic mass.

So: b), b), d)

---

0,0(0 оценок)

Ответ:

veerdenz2099

13.05.2021

Chemistry

---

1) Acidic - gastric juices pH 1, lemon juice pH 2.2, tomato juice pH 4.

2) Neutral - salt solution pH 7.

3) Alkaline - baking soda pH 9, bleach pH 13.

pH is a numeric scale used to specify the acidity or basicity of an aqueous solution.

When pH is less than seven (pH<7), solution is acidic.

When is equal seven (pH = 7), solution is neutral.  

When pH is greater than seven (pH > 7), solution is basic.

---

0,0(0 оценок)