<span>the elements in groups1a, 2a, 3a have positive charges according to their group numbers</span>
Answer:
He has two protons
Li electron has one electron in its outermost orbital.
Number of neutrons of nitrogen = seven neutrons
The second shell of boron: 3 electrons.
Explanation:
An atom is composed of electrons, protons and neutrons. The number of neutrons is determined by subtraction of the atomic number from the mass number.
The electronic configuration is already known for each of atoms in these questions according to standard tables.
Answer:
Flame color is dependent on temperature.
Explanation:
Scientists have learned from various experiments which shows that red flames occurs when the temperature reaches to 980º up to 1,800º Fahrenheit. The colour of flames turn orange when the temperature reaches to 2,000º up to 2,200º Fahrenheit and when the temperature approaches 2,400º to 2,700º Fahrenheit, flames colour turns white.
Answer:
Explanation:
Be careful. The tricky part of the problem is that there are 4 places of sig digs.
m = 6.557 grams
V = 11.16 - 10.50 = 0.66
density = mass/ volume
density = 6.557/0.66 = 9.935 g/mL
